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    24. 

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  25.     <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 open"><span>核心概念</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/5df969/" aria-current="page" class="active sidebar-link">JSX简介</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#什么是jsx" class="sidebar-link">什么是JSX？</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#为什么使用jsx" class="sidebar-link">为什么使用JSX？</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#在-jsx-中嵌入表达式" class="sidebar-link">在 JSX 中嵌入表达式</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#jsx-也是一个表达式" class="sidebar-link">JSX 也是一个表达式</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#jsx-特定属性" class="sidebar-link">JSX 特定属性</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#使用-jsx-指定子元素" class="sidebar-link">使用 JSX 指定子元素</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#jsx-防止注入攻击" class="sidebar-link">JSX 防止注入攻击</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/5df969/#jsx-表示对象" class="sidebar-link">JSX 表示对象</a></li></ul></li><li><a href="/blog/pages/b5d372/" class="sidebar-link">元素渲染</a></li><li><a href="/blog/pages/9ac43a/" class="sidebar-link">组件&amp;Props</a></li><li><a href="/blog/pages/1e3ca2/" class="sidebar-link">State&amp;生命周期</a></li><li><a href="/blog/pages/f27775/" class="sidebar-link">事件处理</a></li><li><a href="/blog/pages/8fcda8/" class="sidebar-link">条件渲染</a></li><li><a href="/blog/pages/88f4b0/" class="sidebar-link">列表&amp;Key</a></li><li><a href="/blog/pages/002db7/" class="sidebar-link">表单</a></li><li><a href="/blog/pages/f0e3d2/" class="sidebar-link">状态提升 (共享状态)</a></li><li><a href="/blog/pages/9ae8e8/" class="sidebar-link">组合vs继承</a></li><li><a href="/blog/pages/c689bf/" class="sidebar-link">React哲学</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>高级指引</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Hook</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>案例演示</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/react/#《React》笔记" data-v-06970110>《React》笔记</a></li><li data-v-06970110><a href="/blog/note/react/#核心概念" data-v-06970110>核心概念</a></li></ul> <div class="info" data-v-06970110><div title="作者" class="author iconfont icon-touxiang" data-v-06970110><a href="https://github.com/heBody" target="_blank" title="作者" class="beLink" data-v-06970110>heBody</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06970110><a href="javascript:;" data-v-06970110>2021-03-24</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,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAeCAYAAAA7MK6iAAAAAXNSR0IArs4c6QAABKFJREFUSA3tVl1oFVcQnrMbrak3QUgkya1akpJYcrUtIqW1JvFBE9LiQ5v6JmJpolbMg32rVrhgoYK0QiMY6i9Y6EMaW5D+xFJaTYItIuK2Kr3+BJNwkxBj05sQY3b3nM6cs2dv9t7NT/vQJw/sndk5M/PNzJkzewGerP+pAmy+ON8lLzUJgA8ZYxYIYZmGYRnctDaWvJJAmTtfP1pvXsBCCPP8QFcCaRkZYACgDZFO4stNIcBCajEOlmmC9XpJ9bAGCaPaPmzPl32dvLSVu3BWCTQs0XQQ6g0DYgwLIoAZbBCdW/i+781o1VVlm/410mw4h06Y7bIPHNyWDyL4FHkX03Q8SrzNhZTZriieckWt7cL6MM85YcLpsi/7O9/iXFT6MswI0DmmpkSaJ0qLxFIm3+i1THHB3zmBH3PYx9CcykcLOeQVVa7QtdxTgQgEleX2AjHYfwA+2ddV77ruGoJUbhGDI09YSNXyMpUt5ylOzxgbUmtOp7NmbNt8v3arjTBfYELmLUV+M+nSawNNAUqpT3ClJWg5I3BLT+cGW/DXNGCa6tx1aakCGEigArTn4TDIPdrXXYKCZNrHLMCOEPvHBlLQ99s9eHB7EB6NTki73CVPQ2F5MSx/uRQixfmq7rK0wYD8w8E905bnPDfwoWs/rfv93NWN/ZfvwsLIU7A09gxECyISeGJkHAau98L97tuw7NXnoPyNF8FcYGLGKsOs0mN3OEyec9esGW/ZEl945dTP34wlR2FZVQWU1q0Cw8Tr7p+hgLLNL0FPxx/Q35mA8aEUrH6nCgwEl0tn7wUiZYJnNRh6DK4UH/k0lfyrsBKdPVv/AriGIQcEDQZ65LBAGe2Rzui9Ybjz7XUppz1/uKBbyVPGkN3ZAeC6hr0x7Nr38N5+EqkoOm17xpoqR9ohQF55ERSvr4Dkr3chNfC3DMzGJlNBElW8w9nsGQvhNGIzDkXzCg8cLK951xHsFBlTJspJNi3ZFIMF2AeDV3q8DNOB+YHi6QTrChDIWDBRi5U5f+ZMfJLu3ccrqxtdxk4SKH336LFxSmkqefwU5T8fhdSdQf9IVKD6aNiwI/hnmcAZ91isYMJIaCUCx9W098+LgruikeTqzqqxKPUwqJyCPJiyemVVZBOijDGjD38Os0jOiSPL1z3SPjXNANbiNPXAdzTfukjjuknNBbyz3nwgTd3AVFqUJ5hpHlq9MveLnWwttUfoygBmvVjuikxND3znrhsELnZk7k+OjIGxeNEkomyLVta0xxn+HZhjBc4YZ/AFjHjz9u3xRZl2BN4aq9nFwWh16IrQ1aHHEd3j1+4/dB9OtH4e29A2H1DyHQRmOSfQZ1Fy7MHBTGB6J/Djq6p3OxyO2cB+4Car7v/o3GXgfAkj23+x9ID1Teoamo/SXcbvSf2PX7Vc8DdCmE1vN9di+32P9/5YR3vLnhCVGUWBjEkr3yh4H8v9CzmsbdhzOKzsJKM90iFdaTMjRPhGVsakRvOaRidljo6H6G7j+ctrJpsP+4COhDIl0La2+FS4+5mlocBaXY5QnGZysIBYoeSsl5qQzrSj/cgNrfuEzlWBfwA+EjrZyWUvpAAAAABJRU5ErkJggg==">JSX简介<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="_01-jsx简介"><a href="#_01-jsx简介" class="header-anchor">#</a> 01. JSX简介</h1> <h2 id="什么是jsx"><a href="#什么是jsx" class="header-anchor">#</a> 什么是JSX？</h2> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> element <span class="token operator">=</span> <span class="token operator">&lt;</span>h1<span class="token operator">&gt;</span>Hello<span class="token punctuation">,</span> world<span class="token operator">!</span><span class="token operator">&lt;</span><span class="token operator">/</span>h1<span class="token operator">&gt;</span><span class="token punctuation">;</span>
    26. 

  26. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>以类似模板语法的方式描述UI的一种语法。它是JS的<strong>语法糖</strong>，<strong>本质上也是JS</strong>。可以在其中使用<strong>变量或表达式、函数等</strong>。</p> <h2 id="为什么使用jsx"><a href="#为什么使用jsx" class="header-anchor">#</a> 为什么使用JSX？</h2> <p>将<em>标记与逻辑</em> 共同存放在称之为“组件”的松散耦合单元之中，来实现<a href="https://en.wikipedia.org/wiki/Separation_of_concerns" target="_blank" rel="noopener noreferrer"><em>关注点分离</em><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>。</p> <p>React不强制使用JSX，但在 JavaScript 代码中将 JSX 和 UI 放在一起时，会在<strong>视觉上有辅助作用</strong>。</p> <h2 id="在-jsx-中嵌入表达式"><a href="#在-jsx-中嵌入表达式" class="header-anchor">#</a> 在 JSX 中嵌入表达式</h2> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> element <span class="token operator">=</span> <span class="token operator">&lt;</span>h1<span class="token operator">&gt;</span>Hello<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token number">2</span><span class="token operator">+</span><span class="token number">2</span><span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>h1<span class="token operator">&gt;</span><span class="token punctuation">;</span>
    27. 

  27. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>在 JSX 语法中，你可以在大括号内放置任何有效的 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Expressions" target="_blank" rel="noopener noreferrer">JavaScript 表达式<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>。</p> <h2 id="jsx-也是一个表达式"><a href="#jsx-也是一个表达式" class="header-anchor">#</a> JSX 也是一个表达式</h2> <p>在编译之后，JSX 表达式会被转为普通 JavaScript 函数调用，并且对其取值后<strong>得到 JavaScript 对象</strong></p> <blockquote><p>可以把JSX当初一个对象来对待，可以使用它赋值给变量、当参数输入函数、返回JSX等。</p></blockquote> <h2 id="jsx-特定属性"><a href="#jsx-特定属性" class="header-anchor">#</a> JSX 特定属性</h2> <p>通过使用引号，来将属性值指定为字符串字面量：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> element <span class="token operator">=</span> <span class="token operator">&lt;</span>div tabIndex<span class="token operator">=</span><span class="token string">&quot;0&quot;</span><span class="token operator">&gt;</span><span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">&gt;</span><span class="token punctuation">;</span>
    28. 

  28. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><blockquote><p>JSX中的属性名使用camelCase(小驼峰)命名。如上面例子中的<code>tabIndex</code></p></blockquote> <p>使用大括号，来在属性值中插入一个 JavaScript 表达式：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">const</span> element <span class="token operator">=</span> <span class="token operator">&lt;</span>img src<span class="token operator">=</span><span class="token punctuation">{</span>user<span class="token punctuation">.</span>avatarUrl<span class="token punctuation">}</span><span class="token operator">&gt;</span><span class="token operator">&lt;</span><span class="token operator">/</span>img<span class="token operator">&gt;</span><span class="token punctuation">;</span>
    29. 

  29. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="使用-jsx-指定子元素"><a href="#使用-jsx-指定子元素" class="header-anchor">#</a> 使用 JSX 指定子元素</h2> <p>JSX 标签里能够包含很多子元素:</p> <div class="language-jsx line-numbers-mode"><pre class="language-jsx"><code><span class="token keyword">const</span> element <span class="token operator">=</span> <span class="token punctuation">(</span>
    30. 

  30.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    31. 

  31.     </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">Hello!</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    32. 

  32.     </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h2</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">Good to see you here.</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h2</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    33. 

  33.   </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    34. 

  34. <span class="token punctuation">)</span><span class="token punctuation">;</span>
    35. 

  35. </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></div></div><h2 id="jsx-防止注入攻击"><a href="#jsx-防止注入攻击" class="header-anchor">#</a> JSX 防止注入攻击</h2> <p>React DOM 在渲染所有输入内容之前，默认会进行<a href="https://stackoverflow.com/questions/7381974/which-characters-need-to-be-escaped-on-html" target="_blank" rel="noopener noreferrer">转义<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>。它可以确保在你的应用中，<strong>永远不会注入那些并非自己明确编写的内容</strong>。所有的内容在渲染之前都被转换成了字符串。这样可以有效地防止 <a href="https://en.wikipedia.org/wiki/Cross-site_scripting" target="_blank" rel="noopener noreferrer">XSS（cross-site-scripting, 跨站脚本）<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>攻击。</p> <h2 id="jsx-表示对象"><a href="#jsx-表示对象" class="header-anchor">#</a> JSX 表示对象</h2> <p>Babel 会把 JSX 转译成一个名为 <code>React.createElement()</code> 函数调用。</p> <p>以下两种示例代码完全等效：</p> <div class="language-jsx line-numbers-mode"><pre class="language-jsx"><code><span class="token keyword">const</span> element <span class="token operator">=</span> <span class="token punctuation">(</span>
    36. 

  36.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>greeting<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    37. 

  37.     Hello, world!
    38. 

  38.   </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span>
    39. 

  39. <span class="token punctuation">)</span><span class="token punctuation">;</span>
    40. 

  40. 

  41. <span class="token keyword">const</span> element <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span>
    42. 

  42.   <span class="token string">'h1'</span><span class="token punctuation">,</span> <span class="token comment">// 标签名</span>
    43. 

  43.   <span class="token punctuation">{</span><span class="token literal-property property">className</span><span class="token operator">:</span> <span class="token string">'greeting'</span><span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token comment">// 属性对象</span>
    44. 

  44.   <span class="token string">'Hello, world!'</span> <span class="token comment">// 内容</span>
    45. 

  45. <span class="token punctuation">)</span><span class="token punctuation">;</span>
    46. 

  46. </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><span class="line-number">11</span><br></div></div></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/《React》笔记/01.核心概念/01.JSX简介.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=React" title="标签">#React</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/b5d372/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">元素渲染</div></a></div> <div class="page-nav"><p class="inner"><!----> <span class="next"><a href="/blog/pages/b5d372/">元素渲染</a>→
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    48. 

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    49. 

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    50. 

  50.             CSS给table的tbody添加滚动条
    51. 

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