Почетна Преглед Помоћ
Регистрација Пријавите се
root
/
blog_web
1
0
Креирај огранак 0
Датотеке Дискусије 0 Захтеви за спајање 0 Вики
Дрво: 28e1978b10
Гране Ознаке
blog_web
/
assets
/
js
/
186.30e344be.js

186.30e344be.js 68 KB
Историја Датотека

1 
  1. (window.webpackJsonp=window.webpackJsonp||[]).push([[186],{513:function(s,t,a){"use strict";a.r(t);var n=a(3),e=Object(n.a)({},(function(){var s=this,t=s._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[t("p",[s._v("拦截器设计与实现")]),s._v(" "),t("h2",{attrs:{id:"需求分析"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#需求分析"}},[s._v("#")]),s._v(" 需求分析")]),s._v(" "),t("p",[s._v("我们希望能对请求的发送和响应做拦截，也就是在发送请求之前和接收到响应之后做一些额外逻辑。")]),s._v(" "),t("p",[s._v("我们希望设计的拦截器的使用方式如下：")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 添加一个请求拦截器")]),s._v("\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("function")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 在发送请求之前可以做一些事情")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("function")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("error"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 处理请求错误")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("Promise")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("reject")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("error"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 添加一个响应拦截器")]),s._v("\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("function")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 处理响应数据")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("function")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("error"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 处理响应错误")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("Promise")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("reject")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("error"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br"),t("span",{staticClass:"line-number"},[s._v("16")]),t("br")])]),t("p",[s._v("在 "),t("code",[s._v("axios")]),s._v(" 对象上有一个 "),t("code",[s._v("interceptors")]),s._v(" 对象属性，该属性又有 "),t("code",[s._v("request")]),s._v(" 和 "),t("code",[s._v("response")]),s._v(" 2 个属性，它们都有一个 "),t("code",[s._v("use")]),s._v(" 方法，"),t("code",[s._v("use")]),s._v(" 方法支持 2 个参数，第一个参数类似 Promise 的 "),t("code",[s._v("resolve")]),s._v(" 函数，第二个参数类似 Promise 的 "),t("code",[s._v("reject")]),s._v(" 函数。我们可以在 "),t("code",[s._v("resolve")]),s._v(" 函数和 "),t("code",[s._v("reject")]),s._v(" 函数中执行同步代码或者是异步代码逻辑。")]),s._v(" "),t("p",[s._v("并且我们是可以添加多个拦截器的，拦截器的执行顺序是链式依次执行的方式。对于 "),t("code",[s._v("request")]),s._v(" 拦截器，后添加的拦截器会在请求前的过程中先执行；对于 "),t("code",[s._v("response")]),s._v(" 拦截器，先添加的拦截器会在响应后先执行。")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[s._v("axios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("headers"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'1'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" config\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("headers"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'2'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" config\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br")])]),t("p",[s._v("此外，我们也可以支持删除某个拦截器，如下：")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("const")]),s._v(" myInterceptor "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" axios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("function")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("/*...*/")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("eject")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("myInterceptor"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br")])]),t("h2",{attrs:{id:"整体设计"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#整体设计"}},[s._v("#")]),s._v(" 整体设计")]),s._v(" "),t("p",[s._v("我们先用一张图来展示一下拦截器工作流程：")]),s._v(" "),t("p",[t("img",{attrs:{src:"https://cdn.jsdelivr.net/gh/xugaoyi/image_store/blog/20200105110744.png",alt:"interceptor",title:"interceptor"}})]),s._v(" "),t("p",[s._v("整个过程是一个链式调用的方式，并且每个拦截器都可以支持同步和异步处理，我们自然而然地就联想到使用 Promise 链的方式来实现整个调用过程。")]),s._v(" "),t("p",[s._v("在这个 Promise 链的执行过程中，请求拦截器 "),t("code",[s._v("resolve")]),s._v(" 函数处理的是 "),t("code",[s._v("config")]),s._v(" 对象，而相应拦截器 "),t("code",[s._v("resolve")]),s._v(" 函数处理的是 "),t("code",[s._v("response")]),s._v(" 对象。")]),s._v(" "),t("p",[s._v("在了解了拦截器工作流程后，我们先要创建一个拦截器管理类，允许我们去添加\n删除和遍历拦截器。")]),s._v(" "),t("h2",{attrs:{id:"拦截器管理类实现"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#拦截器管理类实现"}},[s._v("#")]),s._v(" 拦截器管理类实现")]),s._v(" "),t("p",[s._v("根据需求，"),t("code",[s._v("axios")]),s._v(" 拥有一个 "),t("code",[s._v("interceptors")]),s._v(" 对象属性，该属性又有 "),t("code",[s._v("request")]),s._v(" 和 "),t("code",[s._v("response")]),s._v(" 2 个属性，它们对外提供一个 "),t("code",[s._v("use")]),s._v(" 方法来添加拦截器，我们可以把这俩属性看做是一个拦截器管理对象。"),t("code",[s._v("use")]),s._v(" 方法支持 2 个参数，第一个是 "),t("code",[s._v("resolve")]),s._v(" 函数，第二个是 "),t("code",[s._v("reject")]),s._v(" 函数，对于 "),t("code",[s._v("resolve")]),s._v(" 函数的参数，请求拦截器是 "),t("code",[s._v("AxiosRequestConfig")]),s._v(" 类型的，而响应拦截器是 "),t("code",[s._v("AxiosResponse")]),s._v(" 类型的；而对于 "),t("code",[s._v("reject")]),s._v(" 函数的参数类型则是 "),t("code",[s._v("any")]),s._v(" 类型的。")]),s._v(" "),t("p",[s._v("根据上述分析，我们先来定义一下拦截器管理对象对外的接口。")]),s._v(" "),t("h3",{attrs:{id:"接口定义"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#接口定义"}},[s._v("#")]),s._v(" 接口定义")]),s._v(" "),t("p",[t("code",[s._v("types/index.ts")]),s._v("：")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("export")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("interface")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("AxiosInterceptorManager"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")])]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("resolved"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" ResolvedFn"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" rejected"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("?")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" RejectedFn"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("number")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("eject")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("id"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("number")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("void")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("export")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("interface")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("ResolvedFn"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("any")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")])]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("val"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("|")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("Promise")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("export")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("interface")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("RejectedFn")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("error"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("any")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("any")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br")])]),t("p",[s._v("这里我们定义了 "),t("code",[s._v("AxiosInterceptorManager")]),s._v(" 泛型接口，因为对于 "),t("code",[s._v("resolve")]),s._v(" 函数的参数，请求拦截器和响应拦截器是不同的。")]),s._v(" "),t("h3",{attrs:{id:"代码实现"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#代码实现"}},[s._v("#")]),s._v(" 代码实现")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("import")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v(" ResolvedFn"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" RejectedFn "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'../types'")]),s._v("\n\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("interface")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("Interceptor"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")])]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  resolved"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" ResolvedFn"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n  rejected"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("?")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" RejectedFn\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("export")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("default")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("class")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("InterceptorManager"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")])]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("private")]),s._v(" interceptors"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("Array")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("Interceptor"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("|")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("null")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("constructor")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("[")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("]")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("resolved"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" ResolvedFn"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" rejected"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("?")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" RejectedFn"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("number")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("push")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n      resolved"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v("\n      rejected\n    "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("length "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("1")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("forEach")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token function-variable function"}},[s._v("fn")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" Interceptor"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),t("span",{pre:!0,attrs:{class:"token constant"}},[s._v("T")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("void")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("void")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("forEach")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n      "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("if")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("!==")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("null")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n        "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("fn")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n      "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("eject")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("id"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("number")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("void")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("if")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("[")]),s._v("id"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("]")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n      "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("[")]),s._v("id"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("]")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("null")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br"),t("span",{staticClass:"line-number"},[s._v("16")]),t("br"),t("span",{staticClass:"line-number"},[s._v("17")]),t("br"),t("span",{staticClass:"line-number"},[s._v("18")]),t("br"),t("span",{staticClass:"line-number"},[s._v("19")]),t("br"),t("span",{staticClass:"line-number"},[s._v("20")]),t("br"),t("span",{staticClass:"line-number"},[s._v("21")]),t("br"),t("span",{staticClass:"line-number"},[s._v("22")]),t("br"),t("span",{staticClass:"line-number"},[s._v("23")]),t("br"),t("span",{staticClass:"line-number"},[s._v("24")]),t("br"),t("span",{staticClass:"line-number"},[s._v("25")]),t("br"),t("span",{staticClass:"line-number"},[s._v("26")]),t("br"),t("span",{staticClass:"line-number"},[s._v("27")]),t("br"),t("span",{staticClass:"line-number"},[s._v("28")]),t("br"),t("span",{staticClass:"line-number"},[s._v("29")]),t("br"),t("span",{staticClass:"line-number"},[s._v("30")]),t("br"),t("span",{staticClass:"line-number"},[s._v("31")]),t("br"),t("span",{staticClass:"line-number"},[s._v("32")]),t("br"),t("span",{staticClass:"line-number"},[s._v("33")]),t("br"),t("span",{staticClass:"line-number"},[s._v("34")]),t("br"),t("span",{staticClass:"line-number"},[s._v("35")]),t("br"),t("span",{staticClass:"line-number"},[s._v("36")]),t("br")])]),t("p",[s._v("我们定义了一个 "),t("code",[s._v("InterceptorManager")]),s._v(" 泛型类，内部维护了一个私有属性 "),t("code",[s._v("interceptors")]),s._v("，它是一个数组，用来存储拦截器。该类还对外提供了 3 个方法，其中 "),t("code",[s._v("use")]),s._v(" 接口就是添加拦截器到 "),t("code",[s._v("interceptors")]),s._v(" 中，并返回一个 "),t("code",[s._v("id")]),s._v(" 用于删除；"),t("code",[s._v("forEach")]),s._v(" 接口就是遍历 "),t("code",[s._v("interceptors")]),s._v(" 用的，它支持传入一个函数，遍历过程中会调用该函数，并把每一个 "),t("code",[s._v("interceptor")]),s._v(" 作为该函数的参数传入；"),t("code",[s._v("eject")]),s._v(" 就是删除一个拦截器，通过传入拦截器的 "),t("code",[s._v("id")]),s._v(" 删除。")]),s._v(" "),t("h2",{attrs:{id:"链式调用实现"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#链式调用实现"}},[s._v("#")]),s._v(" 链式调用实现")]),s._v(" "),t("blockquote",[t("p",[s._v("本小节需要你对 Promise 掌握和理解，可以前往 "),t("a",{attrs:{href:"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise",target:"_blank",rel:"noopener noreferrer"}},[s._v("mdn"),t("OutboundLink")],1),s._v(" 学习。")])]),s._v(" "),t("p",[s._v("当我们实现好拦截器管理类，接下来就是在 "),t("code",[s._v("Axios")]),s._v(" 中定义一个 "),t("code",[s._v("interceptors")]),s._v(" 属性，它的类型如下：")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("interface")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("Interceptors")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  request"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" InterceptorManager"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("AxiosRequestConfig"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n  response"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" InterceptorManager"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("AxiosResponse"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("export")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("default")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("class")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("Axios")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  interceptors"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" Interceptors\n\n  "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("constructor")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n      request"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("new")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("InterceptorManager"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("AxiosRequestConfig"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")])]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v("\n      response"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("new")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("InterceptorManager"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("AxiosResponse"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")])]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br")])]),t("p",[t("code",[s._v("Interceptors")]),s._v(" 类型拥有 2 个属性，一个请求拦截器管理类实例，一个是响应拦截器管理类实例。我们在实例化 "),t("code",[s._v("Axios")]),s._v(" 类的时候，在它的构造器去初始化这个 "),t("code",[s._v("interceptors")]),s._v(" 实例属性。")]),s._v(" "),t("p",[s._v("接下来，我们修改 "),t("code",[s._v("request")]),s._v(" 方法的逻辑，添加拦截器链式调用的逻辑：")]),s._v(" "),t("p",[t("code",[s._v("core/Axios.ts")]),s._v("：")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("interface")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("PromiseChain")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  resolved"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" ResolvedFn "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("|")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" AxiosRequestConfig"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" AxiosPromise"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n  rejected"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("?")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" RejectedFn\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n"),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("request")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("url"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("any")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" config"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("?")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("any")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" AxiosPromise "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("if")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("typeof")]),s._v(" url "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("===")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'string'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("if")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("!")]),s._v("config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n      config "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n    config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("url "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" url\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("else")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    config "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" url\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("const")]),s._v(" chain"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" PromiseChain"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("[")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("]")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("[")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    resolved"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" dispatchRequest"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v("\n    rejected"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("undefined")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("]")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("forEach")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    chain"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("unshift")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("this")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("forEach")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    chain"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("push")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("let")]),s._v(" promise "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("Promise")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("resolve")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("while")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("chain"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("length"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("const")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v(" resolved"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" rejected "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" chain"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("shift")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("!")]),s._v("\n    promise "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" promise"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("then")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("resolved"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" rejected"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" promise\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br"),t("span",{staticClass:"line-number"},[s._v("16")]),t("br"),t("span",{staticClass:"line-number"},[s._v("17")]),t("br"),t("span",{staticClass:"line-number"},[s._v("18")]),t("br"),t("span",{staticClass:"line-number"},[s._v("19")]),t("br"),t("span",{staticClass:"line-number"},[s._v("20")]),t("br"),t("span",{staticClass:"line-number"},[s._v("21")]),t("br"),t("span",{staticClass:"line-number"},[s._v("22")]),t("br"),t("span",{staticClass:"line-number"},[s._v("23")]),t("br"),t("span",{staticClass:"line-number"},[s._v("24")]),t("br"),t("span",{staticClass:"line-number"},[s._v("25")]),t("br"),t("span",{staticClass:"line-number"},[s._v("26")]),t("br"),t("span",{staticClass:"line-number"},[s._v("27")]),t("br"),t("span",{staticClass:"line-number"},[s._v("28")]),t("br"),t("span",{staticClass:"line-number"},[s._v("29")]),t("br"),t("span",{staticClass:"line-number"},[s._v("30")]),t("br"),t("span",{staticClass:"line-number"},[s._v("31")]),t("br"),t("span",{staticClass:"line-number"},[s._v("32")]),t("br"),t("span",{staticClass:"line-number"},[s._v("33")]),t("br"),t("span",{staticClass:"line-number"},[s._v("34")]),t("br"),t("span",{staticClass:"line-number"},[s._v("35")]),t("br"),t("span",{staticClass:"line-number"},[s._v("36")]),t("br"),t("span",{staticClass:"line-number"},[s._v("37")]),t("br")])]),t("p",[s._v("首先，构造一个 "),t("code",[s._v("PromiseChain")]),s._v(" 类型的数组 "),t("code",[s._v("chain")]),s._v("，并把 "),t("code",[s._v("dispatchRequest")]),s._v(" 函数赋值给 "),t("code",[s._v("resolved")]),s._v(" 属性；接着先遍历请求拦截器插入到 "),t("code",[s._v("chain")]),s._v(" 的前面；然后再遍历响应拦截器插入到 "),t("code",[s._v("chain")]),s._v(" 后面。")]),s._v(" "),t("p",[s._v("接下来定义一个已经 resolve 的 "),t("code",[s._v("promise")]),s._v("，循环这个 "),t("code",[s._v("chain")]),s._v("，拿到每个拦截器对象，把它们的 "),t("code",[s._v("resolved")]),s._v(" 函数和 "),t("code",[s._v("rejected")]),s._v(" 函数添加到 "),t("code",[s._v("promise.then")]),s._v(" 的参数中，这样就相当于通过 Promise 的链式调用方式，实现了拦截器一层层的链式调用的效果。")]),s._v(" "),t("p",[s._v("注意我们拦截器的执行顺序，对于请求拦截器，先执行后添加的，再执行先添加的；而对于响应拦截器，先执行先添加的，后执行后添加的。")]),s._v(" "),t("h2",{attrs:{id:"demo-编写"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#demo-编写"}},[s._v("#")]),s._v(" demo 编写")]),s._v(" "),t("p",[s._v("在 "),t("code",[s._v("examples")]),s._v(" 目录下创建 "),t("code",[s._v("interceptor")]),s._v(" 目录，在 "),t("code",[s._v("interceptor")]),s._v(" 目录下创建 "),t("code",[s._v("index.html")]),s._v(":")]),s._v(" "),t("div",{staticClass:"language-html line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-html"}},[t("code",[t("span",{pre:!0,attrs:{class:"token doctype"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<!")]),t("span",{pre:!0,attrs:{class:"token doctype-tag"}},[s._v("DOCTYPE")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token name"}},[s._v("html")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),s._v("html")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token attr-name"}},[s._v("lang")]),t("span",{pre:!0,attrs:{class:"token attr-value"}},[t("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v('"')]),s._v("en"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v('"')])]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),s._v("head")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),s._v("meta")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token attr-name"}},[s._v("charset")]),t("span",{pre:!0,attrs:{class:"token attr-value"}},[t("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v('"')]),s._v("utf-8"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v('"')])]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),s._v("title")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("Interceptor example"),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("</")]),s._v("title")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("</")]),s._v("head")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),s._v("body")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n    "),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),s._v("script")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token attr-name"}},[s._v("src")]),t("span",{pre:!0,attrs:{class:"token attr-value"}},[t("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v('"')]),s._v("/__build__/interceptor.js"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v('"')])]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),t("span",{pre:!0,attrs:{class:"token script"}}),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("</")]),s._v("script")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("</")]),s._v("body")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token tag"}},[t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("</")]),s._v("html")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br")])]),t("p",[s._v("接着创建 "),t("code",[s._v("app.ts")]),s._v(" 作为入口文件：")]),s._v(" "),t("div",{staticClass:"language-typescript line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-typescript"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("import")]),s._v(" axios "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'../../src/index'")]),s._v("\n\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("headers"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'1'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" config\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("headers"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'2'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" config\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("request"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("config "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  config"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("headers"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'3'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" config\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("res "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  res"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("data "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'1'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" res\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("let")]),s._v(" interceptor "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" axios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("res "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  res"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("data "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'2'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" res\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("use")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("res "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  res"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("data "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'3'")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("return")]),s._v(" res\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n\naxios"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("interceptors"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("response"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("eject")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("interceptor"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n\n"),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("axios")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  url"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'/interceptor/get'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v("\n  method"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'get'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v("\n  headers"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n    test"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("''")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("then")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("res"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=>")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n  "),t("span",{pre:!0,attrs:{class:"token builtin"}},[s._v("console")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("log")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("res"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("data"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("}")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br"),t("span",{staticClass:"line-number"},[s._v("16")]),t("br"),t("span",{staticClass:"line-number"},[s._v("17")]),t("br"),t("span",{staticClass:"line-number"},[s._v("18")]),t("br"),t("span",{staticClass:"line-number"},[s._v("19")]),t("br"),t("span",{staticClass:"line-number"},[s._v("20")]),t("br"),t("span",{staticClass:"line-number"},[s._v("21")]),t("br"),t("span",{staticClass:"line-number"},[s._v("22")]),t("br"),t("span",{staticClass:"line-number"},[s._v("23")]),t("br"),t("span",{staticClass:"line-number"},[s._v("24")]),t("br"),t("span",{staticClass:"line-number"},[s._v("25")]),t("br"),t("span",{staticClass:"line-number"},[s._v("26")]),t("br"),t("span",{staticClass:"line-number"},[s._v("27")]),t("br"),t("span",{staticClass:"line-number"},[s._v("28")]),t("br"),t("span",{staticClass:"line-number"},[s._v("29")]),t("br"),t("span",{staticClass:"line-number"},[s._v("30")]),t("br"),t("span",{staticClass:"line-number"},[s._v("31")]),t("br"),t("span",{staticClass:"line-number"},[s._v("32")]),t("br"),t("span",{staticClass:"line-number"},[s._v("33")]),t("br"),t("span",{staticClass:"line-number"},[s._v("34")]),t("br"),t("span",{staticClass:"line-number"},[s._v("35")]),t("br"),t("span",{staticClass:"line-number"},[s._v("36")]),t("br"),t("span",{staticClass:"line-number"},[s._v("37")]),t("br"),t("span",{staticClass:"line-number"},[s._v("38")]),t("br"),t("span",{staticClass:"line-number"},[s._v("39")]),t("br")])]),t("p",[s._v("该 demo 我们添加了 3 个请求拦截器，添加了 3 个响应拦截器并删除了第二个。运行该 demo 我们通过浏览器访问，我们发送的请求添加了一个 "),t("code",[s._v("test")]),s._v(" 的请求 header，它的值是 "),t("code",[s._v("321")]),s._v("；我们的响应数据返回的是 "),t("code",[s._v("hello")]),s._v("，经过响应拦截器的处理，最终我们输出的数据是 "),t("code",[s._v("hello13")]),s._v("。")]),s._v(" "),t("p",[s._v("至此，我们给 "),t("code",[s._v("ts-axios")]),s._v(" 实现了拦截器功能，它是一个非常实用的功能，在实际工作中我们可以利用它做一些需求如登录权限认证。")]),s._v(" "),t("p",[s._v("我们目前通过 "),t("code",[s._v("axios")]),s._v(" 发送请求，往往会传入一堆配置，但是我们也希望 "),t("code",[s._v("ts-axios")]),s._v(" 本身也会有一些默认配置，我们把用户传入的自定义配置和默认配置做一层合并。其实，大部分的 JS 库都是类似的玩法。下面一章我们就来实现这个 feature。")])])}),[],!1,null,null,null);t.default=e.exports}}]);
    2.