root
/
blog_web


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143
							<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>泛型 | 彪哥博客</title>
    <meta name="generator" content="VuePress 1.9.5">
    <link rel="icon" href="/blog/img/favicon.ico">
    <meta name="description" content="web前端技术博客,专注web前端学习与总结。JavaScript,js,ES6,TypeScript,vue,React,python,css3,html5,Node,git,github等技术文章。">
    <meta name="keywords" content="前端博客,个人技术博客,前端,前端开发,前端框架,web前端,前端面试题,技术文档,学习,面试,JavaScript,js,ES6,TypeScript,vue,python,css3,html5,Node,git,github,markdown">
    <meta name="theme-color" content="#11a8cd">
    
    <link rel="preload" href="/blog/assets/css/0.styles.cf8cd190.css" as="style"><link rel="preload" href="/blog/assets/js/app.68c9df80.js" as="script"><link rel="preload" href="/blog/assets/js/2.395c0d18.js" as="script"><link rel="preload" href="/blog/assets/js/3.6748bd5c.js" as="script"><link rel="preload" href="/blog/assets/js/169.401b96d4.js" as="script"><link rel="prefetch" href="/blog/assets/js/10.cad3aa70.js"><link rel="prefetch" href="/blog/assets/js/100.08a8b2d8.js"><link rel="prefetch" href="/blog/assets/js/101.2aabb12c.js"><link rel="prefetch" href="/blog/assets/js/102.13f3cc4d.js"><link rel="prefetch" href="/blog/assets/js/103.c19aee03.js"><link rel="prefetch" href="/blog/assets/js/104.91a6aec1.js"><link rel="prefetch" href="/blog/assets/js/105.c39c4cd9.js"><link rel="prefetch" href="/blog/assets/js/106.c34bb1d8.js"><link rel="prefetch" href="/blog/assets/js/107.4a53669b.js"><link rel="prefetch" href="/blog/assets/js/108.a43622c2.js"><link rel="prefetch" href="/blog/assets/js/109.3219d87b.js"><link rel="prefetch" href="/blog/assets/js/11.f2e9eca8.js"><link rel="prefetch" href="/blog/assets/js/110.f41596b0.js"><link rel="prefetch" href="/blog/assets/js/111.da99a105.js"><link rel="prefetch" href="/blog/assets/js/112.9dd75c6f.js"><link rel="prefetch" href="/blog/assets/js/113.9322f157.js"><link rel="prefetch" href="/blog/assets/js/114.c5150cc6.js"><link rel="prefetch" href="/blog/assets/js/115.f58b49f8.js"><link rel="prefetch" href="/blog/assets/js/116.8f7d9c6f.js"><link rel="prefetch" href="/blog/assets/js/117.3c970f48.js"><link rel="prefetch" href="/blog/assets/js/118.921e1d54.js"><link rel="prefetch" href="/blog/assets/js/119.0141defb.js"><link rel="prefetch" href="/blog/assets/js/12.98512c60.js"><link rel="prefetch" href="/blog/assets/js/120.de47a761.js"><link rel="prefetch" href="/blog/assets/js/121.a0b3693a.js"><link rel="prefetch" href="/blog/assets/js/122.6c7dd225.js"><link rel="prefetch" href="/blog/assets/js/123.dbff103c.js"><link rel="prefetch" href="/blog/assets/js/124.493776ef.js"><link rel="prefetch" href="/blog/assets/js/125.f09bc798.js"><link rel="prefetch" href="/blog/assets/js/126.3e28e8a2.js"><link rel="prefetch" href="/blog/assets/js/127.aad20a7e.js"><link rel="prefetch" href="/blog/assets/js/128.6543adba.js"><link rel="prefetch" href="/blog/assets/js/129.d7c56b92.js"><link rel="prefetch" href="/blog/assets/js/13.a79fa0c7.js"><link rel="prefetch" href="/blog/assets/js/130.593d21f0.js"><link rel="prefetch" href="/blog/assets/js/131.4c90d8b8.js"><link rel="prefetch" href="/blog/assets/js/132.4ad12bdc.js"><link rel="prefetch" href="/blog/assets/js/133.485de1b9.js"><link rel="prefetch" href="/blog/assets/js/134.78bc8f57.js"><link rel="prefetch" href="/blog/assets/js/135.47498729.js"><link rel="prefetch" href="/blog/assets/js/136.d99350df.js"><link rel="prefetch" href="/blog/assets/js/137.35d58a22.js"><link rel="prefetch" href="/blog/assets/js/138.75e29c6f.js"><link rel="prefetch" href="/blog/assets/js/139.5af059c1.js"><link rel="prefetch" href="/blog/assets/js/14.0fdf0c78.js"><link rel="prefetch" href="/blog/assets/js/140.0d9b8fbc.js"><link rel="prefetch" href="/blog/assets/js/141.128b6e26.js"><link rel="prefetch" href="/blog/assets/js/142.d7c4dea7.js"><link rel="prefetch" href="/blog/assets/js/143.9aa933f3.js"><link rel="prefetch" href="/blog/assets/js/144.277e558e.js"><link rel="prefetch" href="/blog/assets/js/145.3b994de3.js"><link rel="prefetch" href="/blog/assets/js/146.24441c89.js"><link rel="prefetch" href="/blog/assets/js/147.f7f1952e.js"><link rel="prefetch" href="/blog/assets/js/148.25581f95.js"><link rel="prefetch" href="/blog/assets/js/149.882bdb5a.js"><link rel="prefetch" href="/blog/assets/js/15.fce722b2.js"><link rel="prefetch" href="/blog/assets/js/150.dc1a32f0.js"><link rel="prefetch" href="/blog/assets/js/151.250a4894.js"><link rel="prefetch" href="/blog/assets/js/152.fa700729.js"><link rel="prefetch" href="/blog/assets/js/153.b007c8a2.js"><link rel="prefetch" href="/blog/assets/js/154.8ab912b6.js"><link rel="prefetch" href="/blog/assets/js/155.5ee5b308.js"><link rel="prefetch" href="/blog/assets/js/156.906dc55e.js"><link rel="prefetch" href="/blog/assets/js/157.08c6766f.js"><link rel="prefetch" href="/blog/assets/js/158.53ad5a6c.js"><link rel="prefetch" href="/blog/assets/js/159.a83db4c9.js"><link rel="prefetch" href="/blog/assets/js/16.7cf1b239.js"><link rel="prefetch" href="/blog/assets/js/160.4cded216.js"><link rel="prefetch" href="/blog/assets/js/161.9471d56d.js"><link rel="prefetch" href="/blog/assets/js/162.0c32d380.js"><link rel="prefetch" href="/blog/assets/js/163.41d60a5c.js"><link rel="prefetch" href="/blog/assets/js/164.6dbc8ae8.js"><link rel="prefetch" href="/blog/assets/js/165.7e1b67fe.js"><link rel="prefetch" href="/blog/assets/js/166.ca626fb4.js"><link rel="prefetch" href="/blog/assets/js/167.2f20b6fa.js"><link rel="prefetch" href="/blog/assets/js/168.2e605db8.js"><link rel="prefetch" href="/blog/assets/js/17.cea117e8.js"><link rel="prefetch" href="/blog/assets/js/170.7c8b0366.js"><link rel="prefetch" href="/blog/assets/js/171.c3155533.js"><link rel="prefetch" href="/blog/assets/js/172.b659d767.js"><link rel="prefetch" href="/blog/assets/js/173.62c681db.js"><link rel="prefetch" href="/blog/assets/js/174.5c66f092.js"><link rel="prefetch" href="/blog/assets/js/175.bbbdffbe.js"><link rel="prefetch" href="/blog/assets/js/176.262d26df.js"><link rel="prefetch" href="/blog/assets/js/177.e006c7d1.js"><link rel="prefetch" href="/blog/assets/js/178.8b7976a5.js"><link rel="prefetch" href="/blog/assets/js/179.cf34a2b2.js"><link rel="prefetch" href="/blog/assets/js/18.c338fe95.js"><link rel="prefetch" href="/blog/assets/js/180.d2a4e612.js"><link rel="prefetch" href="/blog/assets/js/181.9338fd07.js"><link rel="prefetch" href="/blog/assets/js/182.e83e4a62.js"><link rel="prefetch" href="/blog/assets/js/183.472c384f.js"><link rel="prefetch" href="/blog/assets/js/184.711e54a6.js"><link rel="prefetch" href="/blog/assets/js/185.20075148.js"><link rel="prefetch" href="/blog/assets/js/186.08c67f20.js"><link rel="prefetch" href="/blog/assets/js/187.0aa1cef8.js"><link rel="prefetch" href="/blog/assets/js/188.5d767d7a.js"><link rel="prefetch" href="/blog/assets/js/189.e8e2eb21.js"><link rel="prefetch" href="/blog/assets/js/19.6b963460.js"><link rel="prefetch" href="/blog/assets/js/190.8b557318.js"><link rel="prefetch" href="/blog/assets/js/191.3e6fdc4f.js"><link rel="prefetch" href="/blog/assets/js/192.99d6e1d8.js"><link rel="prefetch" href="/blog/assets/js/193.4ced091e.js"><link rel="prefetch" href="/blog/assets/js/194.4b375e2e.js"><link rel="prefetch" href="/blog/assets/js/195.003e3d67.js"><link rel="prefetch" href="/blog/assets/js/196.fe952fa6.js"><link rel="prefetch" href="/blog/assets/js/197.ff421a66.js"><link rel="prefetch" href="/blog/assets/js/198.628c2c1a.js"><link rel="prefetch" href="/blog/assets/js/199.89c4e586.js"><link rel="prefetch" href="/blog/assets/js/20.839dae41.js"><link rel="prefetch" href="/blog/assets/js/200.1d9f2ef9.js"><link rel="prefetch" href="/blog/assets/js/201.5ba078d9.js"><link rel="prefetch" href="/blog/assets/js/202.b49b23f4.js"><link rel="prefetch" href="/blog/assets/js/203.d88a03d9.js"><link rel="prefetch" href="/blog/assets/js/204.145e5762.js"><link rel="prefetch" href="/blog/assets/js/205.5a01e256.js"><link rel="prefetch" href="/blog/assets/js/206.5da6ab5c.js"><link rel="prefetch" href="/blog/assets/js/207.02a926dc.js"><link rel="prefetch" href="/blog/assets/js/208.40276146.js"><link rel="prefetch" href="/blog/assets/js/209.edc34975.js"><link rel="prefetch" href="/blog/assets/js/21.bd21bd29.js"><link rel="prefetch" href="/blog/assets/js/210.02e4ee2f.js"><link rel="prefetch" href="/blog/assets/js/211.0f8a9304.js"><link rel="prefetch" href="/blog/assets/js/212.9220dd3d.js"><link rel="prefetch" href="/blog/assets/js/213.89521ebd.js"><link rel="prefetch" href="/blog/assets/js/214.cd5ec468.js"><link rel="prefetch" href="/blog/assets/js/215.0084d772.js"><link rel="prefetch" href="/blog/assets/js/216.ebd468b9.js"><link rel="prefetch" href="/blog/assets/js/217.fac21407.js"><link rel="prefetch" href="/blog/assets/js/218.9793e19a.js"><link rel="prefetch" href="/blog/assets/js/219.c89175e9.js"><link rel="prefetch" href="/blog/assets/js/22.e6bcf65d.js"><link rel="prefetch" href="/blog/assets/js/220.d496e411.js"><link rel="prefetch" href="/blog/assets/js/221.07a9338a.js"><link rel="prefetch" href="/blog/assets/js/222.22bf261f.js"><link rel="prefetch" href="/blog/assets/js/223.b9c6a055.js"><link rel="prefetch" href="/blog/assets/js/224.e29550d2.js"><link rel="prefetch" href="/blog/assets/js/225.a406a2ff.js"><link rel="prefetch" href="/blog/assets/js/226.78192713.js"><link rel="prefetch" href="/blog/assets/js/227.900f2296.js"><link rel="prefetch" href="/blog/assets/js/228.7243da66.js"><link rel="prefetch" href="/blog/assets/js/229.009debcf.js"><link rel="prefetch" href="/blog/assets/js/23.ebbc3fd3.js"><link rel="prefetch" href="/blog/assets/js/230.109a1752.js"><link rel="prefetch" href="/blog/assets/js/231.55d62061.js"><link rel="prefetch" href="/blog/assets/js/232.049029b8.js"><link rel="prefetch" href="/blog/assets/js/233.42dfc185.js"><link rel="prefetch" href="/blog/assets/js/234.4dbf5d59.js"><link rel="prefetch" href="/blog/assets/js/235.f78274d9.js"><link rel="prefetch" href="/blog/assets/js/236.a2b61bec.js"><link rel="prefetch" href="/blog/assets/js/237.6ae31c88.js"><link rel="prefetch" href="/blog/assets/js/238.2f5c56ae.js"><link rel="prefetch" href="/blog/assets/js/239.506a4e9f.js"><link rel="prefetch" href="/blog/assets/js/24.19bd04ec.js"><link rel="prefetch" href="/blog/assets/js/25.b4de33d1.js"><link rel="prefetch" href="/blog/assets/js/26.d9940ceb.js"><link rel="prefetch" href="/blog/assets/js/27.83d848ee.js"><link rel="prefetch" href="/blog/assets/js/28.31289bac.js"><link rel="prefetch" href="/blog/assets/js/29.45af5621.js"><link rel="prefetch" href="/blog/assets/js/30.d5c08e66.js"><link rel="prefetch" href="/blog/assets/js/31.78e43a68.js"><link rel="prefetch" href="/blog/assets/js/32.53ca76ee.js"><link rel="prefetch" href="/blog/assets/js/33.081e8ef6.js"><link rel="prefetch" href="/blog/assets/js/34.cb1866c1.js"><link rel="prefetch" href="/blog/assets/js/35.dca9b927.js"><link rel="prefetch" href="/blog/assets/js/36.0cee37e8.js"><link rel="prefetch" href="/blog/assets/js/37.637acdf4.js"><link rel="prefetch" href="/blog/assets/js/38.6624bf02.js"><link rel="prefetch" href="/blog/assets/js/39.58eab309.js"><link rel="prefetch" href="/blog/assets/js/4.44654b1a.js"><link rel="prefetch" href="/blog/assets/js/40.00ca637c.js"><link rel="prefetch" href="/blog/assets/js/41.2b5e8c27.js"><link rel="prefetch" href="/blog/assets/js/42.350d128c.js"><link rel="prefetch" href="/blog/assets/js/43.871dce82.js"><link rel="prefetch" href="/blog/assets/js/44.6d89c3e1.js"><link rel="prefetch" href="/blog/assets/js/45.6e554c79.js"><link rel="prefetch" href="/blog/assets/js/46.d15a7dc0.js"><link rel="prefetch" href="/blog/assets/js/47.8d66ca97.js"><link rel="prefetch" href="/blog/assets/js/48.3c1102e1.js"><link rel="prefetch" href="/blog/assets/js/49.e17a3436.js"><link rel="prefetch" href="/blog/assets/js/5.88de390f.js"><link rel="prefetch" href="/blog/assets/js/50.451b1c8b.js"><link rel="prefetch" href="/blog/assets/js/51.3799fbac.js"><link rel="prefetch" href="/blog/assets/js/52.f3ef3b5e.js"><link rel="prefetch" href="/blog/assets/js/53.a6bacd25.js"><link rel="prefetch" href="/blog/assets/js/54.dbb7c9ab.js"><link rel="prefetch" href="/blog/assets/js/55.2562d0c8.js"><link rel="prefetch" href="/blog/assets/js/56.14ea4931.js"><link rel="prefetch" href="/blog/assets/js/57.268c586a.js"><link rel="prefetch" href="/blog/assets/js/58.88fed51b.js"><link rel="prefetch" href="/blog/assets/js/59.02b32879.js"><link rel="prefetch" href="/blog/assets/js/6.277038ca.js"><link rel="prefetch" href="/blog/assets/js/60.a27059ce.js"><link rel="prefetch" href="/blog/assets/js/61.39fb215e.js"><link rel="prefetch" href="/blog/assets/js/62.0210588e.js"><link rel="prefetch" href="/blog/assets/js/63.05521a18.js"><link rel="prefetch" href="/blog/assets/js/64.8aa613a8.js"><link rel="prefetch" href="/blog/assets/js/65.acfdd371.js"><link rel="prefetch" href="/blog/assets/js/66.cb805d9b.js"><link rel="prefetch" href="/blog/assets/js/67.39f85baa.js"><link rel="prefetch" href="/blog/assets/js/68.7f79766a.js"><link rel="prefetch" href="/blog/assets/js/69.fa8624bd.js"><link rel="prefetch" href="/blog/assets/js/7.474f8f8d.js"><link rel="prefetch" href="/blog/assets/js/70.1f3e978d.js"><link rel="prefetch" href="/blog/assets/js/71.13cd9358.js"><link rel="prefetch" href="/blog/assets/js/72.739b22a8.js"><link rel="prefetch" href="/blog/assets/js/73.95f69ae2.js"><link rel="prefetch" href="/blog/assets/js/74.b6624f6a.js"><link rel="prefetch" href="/blog/assets/js/75.b0d9aa06.js"><link rel="prefetch" href="/blog/assets/js/76.18ef5b96.js"><link rel="prefetch" href="/blog/assets/js/77.46f6e413.js"><link rel="prefetch" href="/blog/assets/js/78.aebd00ee.js"><link rel="prefetch" href="/blog/assets/js/79.1b784d15.js"><link rel="prefetch" href="/blog/assets/js/8.9428e7ee.js"><link rel="prefetch" href="/blog/assets/js/80.1f550d53.js"><link rel="prefetch" href="/blog/assets/js/81.101cc131.js"><link rel="prefetch" href="/blog/assets/js/82.077c8298.js"><link rel="prefetch" href="/blog/assets/js/83.2e375d11.js"><link rel="prefetch" href="/blog/assets/js/84.38102a34.js"><link rel="prefetch" href="/blog/assets/js/85.24532d6a.js"><link rel="prefetch" href="/blog/assets/js/86.1dabbf00.js"><link rel="prefetch" href="/blog/assets/js/87.9ae389e9.js"><link rel="prefetch" href="/blog/assets/js/88.10e8abd6.js"><link rel="prefetch" href="/blog/assets/js/89.187e5e16.js"><link rel="prefetch" href="/blog/assets/js/9.da143545.js"><link rel="prefetch" href="/blog/assets/js/90.96496e91.js"><link rel="prefetch" href="/blog/assets/js/91.e7933218.js"><link rel="prefetch" href="/blog/assets/js/92.5484868f.js"><link rel="prefetch" href="/blog/assets/js/93.c8ee75e3.js"><link rel="prefetch" href="/blog/assets/js/94.f70985e2.js"><link rel="prefetch" href="/blog/assets/js/95.3abe7fbe.js"><link rel="prefetch" href="/blog/assets/js/96.80e5a938.js"><link rel="prefetch" href="/blog/assets/js/97.1f5e5197.js"><link rel="prefetch" href="/blog/assets/js/98.e3a275c8.js"><link rel="prefetch" href="/blog/assets/js/99.d33bf89e.js">
    <link rel="stylesheet" href="/blog/assets/css/0.styles.cf8cd190.css">
  </head>
  <body class="theme-mode-light">
    <div id="app" data-server-rendered="true"><div class="theme-container sidebar-open have-rightmenu"><header class="navbar blur"><div title="目录" class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/blog/" class="home-link router-link-active"><img src="/blog/img/logo.png" alt="彪哥博客" class="logo"> <span class="site-name can-hide">彪哥博客</span></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><a href="/blog/" class="nav-link">首页</a></div><div class="nav-item"><a href="http://fseller.com" target="_blank" rel="noopener noreferrer" class="nav-link external">
  个人游戏网站
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/blog/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/note/javascript/" class="nav-link">《JavaScript教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/js/" class="nav-link">《JavaScript高级程序设计》</a></li><li class="dropdown-subitem"><a href="/blog/note/es6/" class="nav-link">《ES6 教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/vue/" class="nav-link">《Vue》</a></li><li class="dropdown-subitem"><a href="/blog/note/react/" class="nav-link">《React》</a></li><li class="dropdown-subitem"><a href="/blog/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/blog/note/git/" class="nav-link">《Git》</a></li><li class="dropdown-subitem"><a href="/blog/pages/51afd6/" class="nav-link">TypeScript</a></li><li class="dropdown-subitem"><a href="/blog/pages/4643cd/" class="nav-link">JS设计模式总结</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/blog/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/blog/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="更多" class="dropdown-title"><a href="/blog/more/" class="link-title">更多</a> <span class="title" style="display:none;">更多</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/baaa02/" class="nav-link">实用技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/friends/" class="nav-link">友情链接</a></li></ul></div></div><div class="nav-item"><a href="/blog/about/" class="nav-link">关于</a></div><div class="nav-item"><a href="/blog/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/blog/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/blog/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/blog/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/heBody/blog" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <div class="sidebar-hover-trigger"></div> <aside class="sidebar" style="display:none;"><div class="blogger"><img src="https://fastly.jsdelivr.net/gh/xugaoyi/image_store/blog/20200103123203.jpg"> <div class="blogger-info"><h3>彪哥</h3> <span>爱好前端</span></div></div> <nav class="nav-links"><div class="nav-item"><a href="/blog/" class="nav-link">首页</a></div><div class="nav-item"><a href="http://fseller.com" target="_blank" rel="noopener noreferrer" class="nav-link external">
  个人游戏网站
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/blog/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/note/javascript/" class="nav-link">《JavaScript教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/js/" class="nav-link">《JavaScript高级程序设计》</a></li><li class="dropdown-subitem"><a href="/blog/note/es6/" class="nav-link">《ES6 教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/vue/" class="nav-link">《Vue》</a></li><li class="dropdown-subitem"><a href="/blog/note/react/" class="nav-link">《React》</a></li><li class="dropdown-subitem"><a href="/blog/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/blog/note/git/" class="nav-link">《Git》</a></li><li class="dropdown-subitem"><a href="/blog/pages/51afd6/" class="nav-link">TypeScript</a></li><li class="dropdown-subitem"><a href="/blog/pages/4643cd/" class="nav-link">JS设计模式总结</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/blog/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/blog/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="更多" class="dropdown-title"><a href="/blog/more/" class="link-title">更多</a> <span class="title" style="display:none;">更多</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/baaa02/" class="nav-link">实用技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/friends/" class="nav-link">友情链接</a></li></ul></div></div><div class="nav-item"><a href="/blog/about/" class="nav-link">关于</a></div><div class="nav-item"><a href="/blog/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/blog/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/blog/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/blog/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/heBody/blog" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>TypeScript 常用语法</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/28672e2743bbc3a7/" class="sidebar-link">基础类型</a></li><li><a href="/blog/pages/54add7f5cf78088e/" class="sidebar-link">变量声明</a></li><li><a href="/blog/pages/54ea89b497ec3bb3/" class="sidebar-link">接口</a></li><li><a href="/blog/pages/fad060bd9a8bfac6/" class="sidebar-link">类</a></li><li><a href="/blog/pages/870a51ba2a9edfad/" class="sidebar-link">函数</a></li><li><a href="/blog/pages/8045759ec4ad3c01/" aria-current="page" class="active sidebar-link">泛型</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/8045759ec4ad3c01/#基础示例" class="sidebar-link">基础示例</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/8045759ec4ad3c01/#使用泛型变量" class="sidebar-link">使用泛型变量</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/8045759ec4ad3c01/#泛型类型" class="sidebar-link">泛型类型</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/8045759ec4ad3c01/#泛型类" class="sidebar-link">泛型类</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/8045759ec4ad3c01/#泛型约束" class="sidebar-link">泛型约束</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/8045759ec4ad3c01/#在泛型约束中使用类型参数" class="sidebar-link">在泛型约束中使用类型参数</a></li></ul></li></ul></li><li><a href="/blog/pages/7279420c899c505d/" class="sidebar-link">类型推断</a></li><li><a href="/blog/pages/3fb6c2f52ab398e3/" class="sidebar-link">高级类型</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 项目初始化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 基础功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 异常情况处理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 接口扩展</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 拦截器实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 配置化实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 更多功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 单元测试</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06970110><div class="articleInfo" data-v-06970110><ul class="breadcrumbs" data-v-06970110><li data-v-06970110><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06970110></a></li> <li data-v-06970110><a href="/blog/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06970110>《TypeScript 从零实现 axios》</a></li><li data-v-06970110><a href="/blog/note/typescript-axios/#TypeScript 常用语法" data-v-06970110>TypeScript 常用语法</a></li></ul> <div class="info" data-v-06970110><div title="作者" class="author iconfont icon-touxiang" data-v-06970110><a href="javascript:;" data-v-06970110>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06970110><a href="javascript:;" data-v-06970110>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">泛型<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="泛型"><a href="#泛型" class="header-anchor">#</a> 泛型</h1> <p>软件工程中，我们不仅要创建定义良好且一致的 API，同时也要考虑可重用性。 组件不仅能够支持当前的数据类型，同时也能支持未来的数据类型，这在创建大型系统时为你提供了十分灵活的功能。</p> <p>在像 C# 和 Java 这样的语言中，可以使用泛型来创建可重用的组件，一个组件可以支持多种类型的数据。 这样用户就可以以自己的数据类型来使用组件。</p> <h2 id="基础示例"><a href="#基础示例" class="header-anchor">#</a> 基础示例</h2> <p>下面来创建第一个使用泛型的例子：<code>identity</code> 函数。 这个函数会返回任何传入它的值。 你可以把这个函数当成是 <code>echo</code> 命令。</p> <p>不用泛型的话，这个函数可能是下面这样：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">identity</span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">number</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>或者，我们使用 <code>any</code> 类型来定义函数：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">identity</span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>使用 <code>any</code> 类型会导致这个函数可以接收任何类型的 <code>arg</code> 参数，但是这样就丢失了一些信息：传入的类型与返回的类型应该是相同的。如果我们传入一个数字，我们只知道任何类型的值都有可能被返回。</p> <p>因此，我们需要一种方法使返回值的类型与传入参数的类型是相同的。这里，我们使用了<em>类型变量</em>，它是一种特殊的变量，只用于表示类型而不是值。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>我们给 <code>identity</code> 添加了类型变量 <code>T</code>。 <code>T</code> 帮助我们捕获用户传入的类型（比如：<code>number</code>），之后我们就可以使用这个类型。 之后我们再次使用了 <code>T</code> 当做返回值类型。现在我们可以知道参数类型与返回值类型是相同的了。这允许我们跟踪函数里使用的类型的信息。</p> <p>我们把这个版本的 <code>identity</code> 函数叫做泛型，因为它可以适用于多个类型。 不同于使用 <code>any</code>，它不会丢失信息，像第一个例子那像保持准确性，传入数值类型并返回数值类型。</p> <p>我们定义了泛型函数后，可以用两种方法使用。 第一种是，传入所有的参数，包含类型参数：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">let</span> output <span class="token operator">=</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token builtin">string</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span><span class="token string">'myString'</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这里我们明确的指定了 <code>T</code> 是 <code>string</code> 类型，并做为一个参数传给函数，使用了 <code>&lt;&gt;</code> 括起来而不是 <code>()</code>。</p> <p>第二种方法更普遍。利用了<em>类型推论</em> -- 即编译器会根据传入的参数自动地帮助我们确定 <code>T</code> 的类型：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">let</span> output <span class="token operator">=</span> <span class="token function">identity</span><span class="token punctuation">(</span><span class="token string">'myString'</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>注意我们没必要使用尖括号（<code>&lt;&gt;</code>）来明确地传入类型；编译器可以查看 <code>myString</code> 的值，然后把 <code>T</code> 设置为它的类型。 类型推论帮助我们保持代码精简和高可读性。如果编译器不能够自动地推断出类型的话，只能像上面那样明确的传入 <code>T</code> 的类型，在一些复杂的情况下，这是可能出现的。</p> <h2 id="使用泛型变量"><a href="#使用泛型变量" class="header-anchor">#</a> 使用泛型变量</h2> <p>使用泛型创建像 <code>identity</code> 这样的泛型函数时，编译器要求你在函数体必须正确的使用这个通用的类型。 换句话说，你必须把这些参数当做是任意或所有类型。</p> <p>看下之前 <code>identity</code> 例子：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>如果我们想打印出 <code>arg</code> 的长度。 我们很可能会这样做：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">loggingIdentity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>arg<span class="token punctuation">.</span>length<span class="token punctuation">)</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>如果这么做，编译器会报错说我们使用了 <code>arg</code> 的 <code>.length</code> 属性，但是没有地方指明 <code>arg</code> 具有这个属性。记住，这些类型变量代表的是任意类型，所以使用这个函数的人可能传入的是个数字，而数字是没有 <code>.length</code> 属性的。</p> <p>现在假设我们想操作 <code>T</code> 类型的数组而不直接是 <code>T</code>。由于我们操作的是数组，所以 <code>.length</code> 属性是应该存在的。我们可以像创建其它数组一样创建这个数组：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">loggingIdentity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token punctuation">{</span>
  <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>arg<span class="token punctuation">.</span>length<span class="token punctuation">)</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>你可以这样理解 <code>loggingIdentity</code> 的类型：泛型函数 <code>loggingIdentity</code>，接收类型参数 <code>T</code> 和参数 <code>arg</code>，它是个元素类型是 <code>T</code> 的数组，并返回元素类型是<code>T</code> 的数组。 如果我们传入数字数组，将返回一个数字数组，因为此时 <code>T</code> 的的类型为 <code>number</code>。 这可以让我们把泛型变量 <code>T</code> 当做类型的一部分使用，而不是整个类型，增加了灵活性。</p> <h2 id="泛型类型"><a href="#泛型类型" class="header-anchor">#</a> 泛型类型</h2> <p>上一节，我们创建了 <code>identity</code> 通用函数，可以适用于不同的类型。 在这节，我们研究一下函数本身的类型，以及如何创建泛型接口。</p> <p>泛型函数的类型与非泛型函数的类型没什么不同，只是有一个类型参数在最前面，像函数声明一样：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>

<span class="token keyword">let</span> myIdentity<span class="token operator">:</span> <span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token constant">T</span> <span class="token operator">=</span> identity
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>我们也可以使用不同的泛型参数名，只要在数量上和使用方式上能对应上就可以。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>

<span class="token keyword">let</span> myIdentity<span class="token operator">:</span> <span class="token operator">&lt;</span><span class="token constant">U</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">U</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token constant">U</span> <span class="token operator">=</span> identity
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>我们还可以使用带有调用签名的对象字面量来定义泛型函数：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>

<span class="token keyword">let</span> myIdentity<span class="token operator">:</span> <span class="token punctuation">{</span><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">}</span> <span class="token operator">=</span> identity
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>这引导我们去写第一个泛型接口了。我们把上面例子里的对象字面量拿出来做为一个接口：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">interface</span> <span class="token class-name">GenericIdentityFn</span> <span class="token punctuation">{</span>
  <span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>

<span class="token keyword">let</span> myIdentity<span class="token operator">:</span> GenericIdentityFn <span class="token operator">=</span> identity
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>我们甚至可以把泛型参数当作整个接口的一个参数。 这样我们就能清楚的知道使用的具体是哪个泛型类型（比如： <code>Dictionary&lt;string&gt;</code> 而不只是<code>Dictionary</code>）。这样接口里的其它成员也能知道这个参数的类型了。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">interface</span> <span class="token class-name">GenericIdentityFn<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span> <span class="token punctuation">{</span>
  <span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token generic-function"><span class="token function">identity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>

<span class="token keyword">let</span> myIdentity<span class="token operator">:</span> GenericIdentityFn<span class="token operator">&lt;</span><span class="token builtin">number</span><span class="token operator">&gt;</span> <span class="token operator">=</span> identity
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>注意，我们的示例做了少许改动。 不再描述泛型函数，而是把非泛型函数签名作为泛型类型一部分。 当我们使用 <code>GenericIdentityFn</code> 的时候，还得传入一个类型参数来指定泛型类型（这里是：<code>number</code>），锁定了之后代码里使用的类型。对于描述哪部分类型属于泛型部分来说，理解何时把参数放在调用签名里和何时放在接口上是很有帮助的。</p> <p>除了泛型接口，我们还可以创建泛型类。 注意，无法创建泛型枚举和泛型命名空间。</p> <h2 id="泛型类"><a href="#泛型类" class="header-anchor">#</a> 泛型类</h2> <p>泛型类看上去与泛型接口差不多。 泛型类使用（ <code>&lt;&gt;</code>）括起泛型类型，跟在类名后面。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">class</span> <span class="token class-name">GenericNumber<span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span> <span class="token punctuation">{</span>
  zeroValue<span class="token operator">:</span> <span class="token constant">T</span>
  <span class="token function-variable function">add</span><span class="token operator">:</span> <span class="token punctuation">(</span>x<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">,</span> y<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token constant">T</span>
<span class="token punctuation">}</span>

<span class="token keyword">let</span> myGenericNumber <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">GenericNumber<span class="token operator">&lt;</span><span class="token builtin">number</span><span class="token operator">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
myGenericNumber<span class="token punctuation">.</span>zeroValue <span class="token operator">=</span> <span class="token number">0</span>
myGenericNumber<span class="token punctuation">.</span><span class="token function-variable function">add</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> x <span class="token operator">+</span> y
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p><code>GenericNumber</code> 类的使用是十分直观的，并且你可能已经注意到了，没有什么去限制它只能使用 <code>number</code> 类型。 也可以使用字符串或其它更复杂的类型。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">let</span> stringNumeric <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">GenericNumber<span class="token operator">&lt;</span><span class="token builtin">string</span><span class="token operator">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
stringNumeric<span class="token punctuation">.</span>zeroValue <span class="token operator">=</span> <span class="token string">''</span>
stringNumeric<span class="token punctuation">.</span><span class="token function-variable function">add</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> x <span class="token operator">+</span> y
<span class="token punctuation">}</span>

<span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>stringNumeric<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>stringNumeric<span class="token punctuation">.</span>zeroValue<span class="token punctuation">,</span> <span class="token string">'test'</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>与接口一样，直接把泛型类型放在类后面，可以帮助我们确认类的所有属性都在使用相同的类型。</p> <p>我们在<a href="/chapter2/class">类</a>那节说过，类有两部分：静态部分和实例部分。 泛型类指的是实例部分的类型，所以类的静态属性不能使用这个泛型类型。</p> <h2 id="泛型约束"><a href="#泛型约束" class="header-anchor">#</a> 泛型约束</h2> <p>我们有时候想操作某类型的一组值，并且我们知道这组值具有什么样的属性。在 <code>loggingIdentity</code> 例子中，我们想访问 <code>arg</code> 的 <code>length</code> 属性，但是编译器并不能证明每种类型都有 <code>length</code> 属性，所以就报错了。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">loggingIdentity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>arg<span class="token punctuation">.</span>length<span class="token punctuation">)</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>相比于操作 <code>any</code> 所有类型，我们想要限制函数去处理任意带有 <code>.length</code> 属性的所有类型。 只要传入的类型有这个属性，我们就允许，就是说至少包含这一属性。为此，我们需要列出对于 <code>T</code> 的约束要求。</p> <p>我们定义一个接口来描述约束条件，创建一个包含 <code>.length</code> 属性的接口，使用这个接口和 <code>extends</code> 关键字来实现约束：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">interface</span> <span class="token class-name">Lengthwise</span> <span class="token punctuation">{</span>
  length<span class="token operator">:</span> <span class="token builtin">number</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token generic-function"><span class="token function">loggingIdentity</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span> <span class="token keyword">extends</span> Lengthwise<span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>arg<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>arg<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token comment">// OK</span>
  <span class="token keyword">return</span> arg
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><p>现在这个泛型函数被定义了约束，因此它不再是适用于任意类型：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">loggingIdentity</span><span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// Error</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>我们需要传入符合约束类型的值，必须包含必须的属性：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">loggingIdentity</span><span class="token punctuation">(</span><span class="token punctuation">{</span>length<span class="token operator">:</span> <span class="token number">10</span><span class="token punctuation">,</span> value<span class="token operator">:</span> <span class="token number">3</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment">// OK</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="在泛型约束中使用类型参数"><a href="#在泛型约束中使用类型参数" class="header-anchor">#</a> 在泛型约束中使用类型参数</h3> <p>你可以声明一个类型参数，且它被另一个类型参数所约束。 比如，现在我们想要用属性名从对象里获取这个属性。 并且我们想要确保这个属性存在于对象 <code>obj</code> 上，因此我们需要在这两个类型之间使用约束。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">getProperty</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token punctuation">,</span> <span class="token constant">K</span> <span class="token keyword">extends</span> <span class="token keyword">keyof</span> <span class="token constant">T</span><span class="token operator">&gt;</span></span></span> <span class="token punctuation">(</span>obj<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">,</span> key<span class="token operator">:</span> <span class="token constant">K</span> <span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span>
<span class="token punctuation">}</span>

<span class="token keyword">let</span> x <span class="token operator">=</span> <span class="token punctuation">{</span>a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span> b<span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span> c<span class="token operator">:</span> <span class="token number">3</span><span class="token punctuation">,</span> d<span class="token operator">:</span> <span class="token number">4</span><span class="token punctuation">}</span>

<span class="token function">getProperty</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> <span class="token string">'a'</span><span class="token punctuation">)</span> <span class="token comment">// okay</span>
<span class="token function">getProperty</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> <span class="token string">'m'</span><span class="token punctuation">)</span> <span class="token comment">// error</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/《TypeScript 从零实现 axios》/02.TypeScript 常用语法/06.泛型.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="tags"><a href="/blog/tags/?tag=TypeScript" title="标签">#TypeScript</a></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/12/14, 19:36:42</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/blog/pages/870a51ba2a9edfad/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">函数</div></a> <a href="/blog/pages/7279420c899c505d/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">类型推断</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
        ←
        <a href="/blog/pages/870a51ba2a9edfad/" class="prev">函数</a></span> <span class="next"><a href="/blog/pages/7279420c899c505d/">类型推断</a>→
      </span></p></div></div></div> <div class="article-list"><div class="article-title"><a href="/blog/archives/" class="iconfont icon-bi">最近更新</a></div> <div class="article-wrapper"><dl><dd>01</dd> <dt><a href="/blog/pages/922650/"><div>
            Git修改分支名
            <!----></div></a> <span class="date">08-11</span></dt></dl><dl><dd>02</dd> <dt><a href="/blog/pages/55f894/"><div>
            CSS给table的tbody添加滚动条
            <!----></div></a> <span class="date">06-29</span></dt></dl><dl><dd>03</dd> <dt><a href="/blog/pages/829589/"><div>
            我做了一个手写春联小网页，祝大家虎年暴富
            <span class="title-tag">
              原创
            </span></div></a> <span class="date">01-28</span></dt></dl> <dl><dd></dd> <dt><a href="/blog/archives/" class="more">更多文章&gt;</a></dt></dl></div></div></main></div> <div class="footer"><div class="icons"><a href="mailto:30363811@qq.com" title="发邮件" target="_blank" class="iconfont icon-youjian"></a><a href="https://github.com/heBody" title="GitHub" target="_blank" class="iconfont icon-github"></a></div> 
    Copyright © 2016-2022
    <span>Hesb | <a href="https://github.com/heBody/blob" target="_blank">MIT License</a></span></div> <div class="buttons"><div title="返回顶部" class="button blur go-to-top iconfont icon-fanhuidingbu" style="display:none;"></div> <div title="去评论" class="button blur go-to-comment iconfont icon-pinglun" style="display:none;"></div> <div title="主题模式" class="button blur theme-mode-but iconfont icon-zhuti"><ul class="select-box" style="display:none;"><li class="iconfont icon-zidong">
          跟随系统
        </li><li class="iconfont icon-rijianmoshi">
          浅色模式
        </li><li class="iconfont icon-yejianmoshi">
          深色模式
        </li><li class="iconfont icon-yuedu">
          阅读模式
        </li></ul></div></div> <!----> <!----> <!----></div><div class="global-ui"><div></div></div></div>
    <script src="/blog/assets/js/app.68c9df80.js" defer></script><script src="/blog/assets/js/2.395c0d18.js" defer></script><script src="/blog/assets/js/3.6748bd5c.js" defer></script><script src="/blog/assets/js/169.401b96d4.js" defer></script>
  </body>
</html>