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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/" class="sidebar-link">JSX简介</a></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/" aria-current="page" class="active sidebar-link">状态提升 (共享状态)</a><ul class="sidebar-sub-headers"></ul></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>2021-03-26</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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">状态提升 (共享状态)<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="_09-状态提升-共享状态"><a href="#_09-状态提升-共享状态" class="header-anchor">#</a> 09. 状态提升 (共享状态)</h1> <p>通常，<strong>多个组件需要反映相同的变化数据，这时我们建议将共享状态提升到最近的共同父组件中去</strong>。</p> <p>在 React 中，<strong>将多个组件中需要共享的 state 向上移动到它们的最近共同父组件中，便可实现共享 state。这就是所谓的“状态提升”</strong></p> <p>两个输入框共享数据的例子：</p> <div class="language-jsx line-numbers-mode"><pre class="language-jsx"><code><span class="token keyword">const</span> scaleNames <span class="token operator">=</span> <span class="token punctuation">{</span>
    26. 

  26.   <span class="token literal-property property">c</span><span class="token operator">:</span> <span class="token string">'摄氏度'</span><span class="token punctuation">,</span>
    27. 

  27.   <span class="token literal-property property">f</span><span class="token operator">:</span> <span class="token string">'华氏度'</span>
    28. 

  28. <span class="token punctuation">}</span><span class="token punctuation">;</span>
    29. 

  29. 

  30. <span class="token comment">// 转摄氏度</span>
    31. 

  31. <span class="token keyword">function</span> <span class="token function">toCelsius</span><span class="token punctuation">(</span><span class="token parameter">fahrenheit</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    32. 

  32.   <span class="token keyword">return</span> <span class="token punctuation">(</span>fahrenheit <span class="token operator">-</span> <span class="token number">32</span><span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token number">5</span> <span class="token operator">/</span> <span class="token number">9</span><span class="token punctuation">;</span>
    33. 

  33. <span class="token punctuation">}</span>
    34. 

  34. 

  35. <span class="token comment">// 转华氏度</span>
    36. 

  36. <span class="token keyword">function</span> <span class="token function">toFahrenheit</span><span class="token punctuation">(</span><span class="token parameter">celsius</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    37. 

  37.   <span class="token keyword">return</span> <span class="token punctuation">(</span>celsius <span class="token operator">*</span> <span class="token number">9</span> <span class="token operator">/</span> <span class="token number">5</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token number">32</span><span class="token punctuation">;</span>
    38. 

  38. <span class="token punctuation">}</span>
    39. 

  39. 

  40. <span class="token comment">// 转换，为空时返回空，否则返回保留三位小数的浮点数</span>
    41. 

  41. <span class="token keyword">function</span> <span class="token function">tryConvert</span><span class="token punctuation">(</span><span class="token parameter">temperature<span class="token punctuation">,</span> convert</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    42. 

  42.   <span class="token keyword">const</span> input <span class="token operator">=</span> <span class="token function">parseFloat</span><span class="token punctuation">(</span>temperature<span class="token punctuation">)</span><span class="token punctuation">;</span>
    43. 

  43.   <span class="token keyword">if</span> <span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">isNaN</span><span class="token punctuation">(</span>input<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    44. 

  44.     <span class="token keyword">return</span> <span class="token string">''</span><span class="token punctuation">;</span>
    45. 

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

  46.   <span class="token keyword">const</span> output <span class="token operator">=</span> <span class="token function">convert</span><span class="token punctuation">(</span>input<span class="token punctuation">)</span><span class="token punctuation">;</span>
    47. 

  47.   <span class="token comment">// Math.round返回一个数字四舍五入后的整数</span>
    48. 

  48.   <span class="token keyword">const</span> rounded <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">round</span><span class="token punctuation">(</span>output <span class="token operator">*</span> <span class="token number">1000</span><span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">1000</span><span class="token punctuation">;</span>
    49. 

  49.   <span class="token keyword">return</span> rounded<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    50. 

  50. <span class="token punctuation">}</span>
    51. 

  51. 

  52. <span class="token comment">// 水是否会沸腾</span>
    53. 

  53. <span class="token keyword">function</span> <span class="token function">BoilingVerdict</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    54. 

  54.   <span class="token keyword">if</span> <span class="token punctuation">(</span>props<span class="token punctuation">.</span>celsius <span class="token operator">&gt;=</span> <span class="token number">100</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    55. 

  55.     <span class="token keyword">return</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">水会沸腾.</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">;</span>
    56. 

  56.   <span class="token punctuation">}</span>
    57. 

  57.   <span class="token keyword">return</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">水不会沸腾.</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">;</span>
    58. 

  58. <span class="token punctuation">}</span>
    59. 

  59. 

  60. <span class="token comment">// 子组件 - 输入框</span>
    61. 

  61. <span class="token keyword">class</span> <span class="token class-name">TemperatureInput</span> <span class="token keyword">extends</span> <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
    62. 

  62.   <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    63. 

  63.     <span class="token keyword">super</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 接收父组件传入props</span>
    64. 

  64.     <span class="token keyword">this</span><span class="token punctuation">.</span>handleChange <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">handleChange</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 绑定回调函数，并修正this</span>
    65. 

  65.   <span class="token punctuation">}</span>
    66. 

  66. 	
    67. 

  67.   <span class="token comment">// 处理change</span>
    68. 

  68.   <span class="token function">handleChange</span><span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    69. 

  69.     <span class="token comment">// e是合成事件对象，通过e.target.value 取值</span>
    70. 

  70.     <span class="token comment">// 调用父组件传入的onTemperatureChange函数，并传值</span>
    71. 

  71.     <span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span><span class="token function">onTemperatureChange</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
    72. 

  72.     
    73. 

  73.     <span class="token comment">// 当子组件输入框值改变时调用父组件的onTemperatureChange方法，并传出值。</span>
    74. 

  74.     <span class="token comment">// 另外，onTemperatureChange命名方式：`在&lt;子组件&gt;变更`</span>
    75. 

  75.   <span class="token punctuation">}</span>
    76. 

  76. 

  77.   <span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    78. 

  78.     <span class="token comment">// 接收父组件传入的温度值</span>
    79. 

  79.     <span class="token keyword">const</span> temperature <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>temperature<span class="token punctuation">;</span>
    80. 

  80.     <span class="token comment">// 接收父组件传入的衡量方式</span>
    81. 

  81.     <span class="token keyword">const</span> scale <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>scale<span class="token punctuation">;</span>
    82. 

  82.     
    83. 

  83.     <span class="token keyword">return</span> <span class="token punctuation">(</span>
    84. 

  84.       <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>fieldset</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    85. 

  85.         </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>legend</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">输入温度-</span><span class="token punctuation">{</span>scaleNames<span class="token punctuation">[</span>scale<span class="token punctuation">]</span><span class="token punctuation">}</span><span class="token plain-text">:</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>legend</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    86. 

  86.         </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">value</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>temperature<span class="token punctuation">}</span></span>
    87. 

  87.                <span class="token attr-name">onChange</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>handleChange<span class="token punctuation">}</span></span> <span class="token punctuation">/&gt;</span></span><span class="token plain-text">
    88. 

  88.       </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>fieldset</span><span class="token punctuation">&gt;</span></span>
    89. 

  89.     <span class="token punctuation">)</span><span class="token punctuation">;</span>
    90. 

  90.   <span class="token punctuation">}</span>
    91. 

  91. <span class="token punctuation">}</span>
    92. 

  92. 

  93. 

  94. <span class="token comment">// 父组件 - 计算器</span>
    95. 

  95. <span class="token keyword">class</span> <span class="token class-name">Calculator</span> <span class="token keyword">extends</span> <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
    96. 

  96.   <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    97. 

  97.     <span class="token keyword">super</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 接收父组件传入props</span>
    98. 

  98.     
    99. 

  99.     <span class="token comment">// 绑定事件回调，并修正this</span>
    100. 

  100.     <span class="token keyword">this</span><span class="token punctuation">.</span>handleCelsiusChange <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">handleCelsiusChange</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    101. 

  101.     <span class="token keyword">this</span><span class="token punctuation">.</span>handleFahrenheitChange <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">handleFahrenheitChange</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    102. 

  102.     <span class="token comment">// 创建初始状态值</span>
    103. 

  103.     <span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token literal-property property">temperature</span><span class="token operator">:</span> <span class="token string">''</span><span class="token punctuation">,</span> <span class="token literal-property property">scale</span><span class="token operator">:</span> <span class="token string">'c'</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
    104. 

  104.   <span class="token punctuation">}</span>
    105. 

  105. 	
    106. 

  106.   <span class="token comment">// 处理`摄氏度`变更</span>
    107. 

  107.   <span class="token function">handleCelsiusChange</span><span class="token punctuation">(</span><span class="token parameter">temperature</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    108. 

  108.     <span class="token comment">// temperature接收到子组件传来的参数，并通过setState修改状态</span>
    109. 

  109.     <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token literal-property property">scale</span><span class="token operator">:</span> <span class="token string">'c'</span><span class="token punctuation">,</span> temperature<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    110. 

  110.   <span class="token punctuation">}</span>
    111. 

  111. 	
    112. 

  112.   <span class="token comment">// 处理`华氏度`变更</span>
    113. 

  113.   <span class="token function">handleFahrenheitChange</span><span class="token punctuation">(</span><span class="token parameter">temperature</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    114. 

  114.     <span class="token comment">// temperature接收到子组件传来的参数，并通过setState修改状态</span>
    115. 

  115.     <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token literal-property property">scale</span><span class="token operator">:</span> <span class="token string">'f'</span><span class="token punctuation">,</span> temperature<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    116. 

  116.   <span class="token punctuation">}</span>
    117. 

  117. 	
    118. 

  118.   <span class="token comment">// 渲染函数（每当state改变都会调用）</span>
    119. 

  119.   <span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    120. 

  120.     <span class="token comment">// 取得当前state下的值</span>
    121. 

  121.     <span class="token keyword">const</span> scale <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>scale<span class="token punctuation">;</span>
    122. 

  122.     <span class="token keyword">const</span> temperature <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>temperature<span class="token punctuation">;</span>
    123. 

  123.     
    124. 

  124.     <span class="token comment">// 根据scale值取得相应的温度数据</span>
    125. 

  125.     <span class="token keyword">const</span> celsius <span class="token operator">=</span> scale <span class="token operator">===</span> <span class="token string">'f'</span> <span class="token operator">?</span> <span class="token function">tryConvert</span><span class="token punctuation">(</span>temperature<span class="token punctuation">,</span> toCelsius<span class="token punctuation">)</span> <span class="token operator">:</span> temperature<span class="token punctuation">;</span>
    126. 

  126.     <span class="token keyword">const</span> fahrenheit <span class="token operator">=</span> scale <span class="token operator">===</span> <span class="token string">'c'</span> <span class="token operator">?</span> <span class="token function">tryConvert</span><span class="token punctuation">(</span>temperature<span class="token punctuation">,</span> toFahrenheit<span class="token punctuation">)</span> <span class="token operator">:</span> temperature<span class="token punctuation">;</span>
    127. 

  127. 		
    128. 

  128.     <span class="token comment">// 返回渲染的元素</span>
    129. 

  129.     <span class="token comment">// 插入子组件TemperatureInput传入相应的参数，onTemperatureChange指定为当前组件的回调函数</span>
    130. 

  130.     <span class="token keyword">return</span> <span class="token punctuation">(</span>
    131. 

  131.       <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">
    132. 

  132.         </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">TemperatureInput</span></span>
    133. 

  133.           <span class="token attr-name">scale</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>c<span class="token punctuation">&quot;</span></span>
    134. 

  134.           <span class="token attr-name">temperature</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>celsius<span class="token punctuation">}</span></span>
    135. 

  135.           <span class="token attr-name">onTemperatureChange</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>handleCelsiusChange<span class="token punctuation">}</span></span> <span class="token punctuation">/&gt;</span></span><span class="token plain-text">
    136. 

  136.         </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">TemperatureInput</span></span>
    137. 

  137.           <span class="token attr-name">scale</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>f<span class="token punctuation">&quot;</span></span>
    138. 

  138.           <span class="token attr-name">temperature</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>fahrenheit<span class="token punctuation">}</span></span>
    139. 

  139.           <span class="token attr-name">onTemperatureChange</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>handleFahrenheitChange<span class="token punctuation">}</span></span> <span class="token punctuation">/&gt;</span></span><span class="token plain-text">
    140. 

  140.         </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">BoilingVerdict</span></span>
    141. 

  141.           <span class="token attr-name">celsius</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token function">parseFloat</span><span class="token punctuation">(</span>celsius<span class="token punctuation">)</span><span class="token punctuation">}</span></span> <span class="token punctuation">/&gt;</span></span><span class="token plain-text">
    142. 

  142.       </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    143. 

  143.     <span class="token punctuation">)</span><span class="token punctuation">;</span>
    144. 

  144.   <span class="token punctuation">}</span>
    145. 

  145. <span class="token punctuation">}</span>
    146. 

  146. 

  147. <span class="token comment">// 渲染DOM</span>
    148. 

  148. ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>
    149. 

  149.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">Calculator</span></span> <span class="token punctuation">/&gt;</span></span><span class="token punctuation">,</span>
    150. 

  150.   document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'root'</span><span class="token punctuation">)</span>
    151. 

  151. <span class="token punctuation">)</span><span class="token punctuation">;</span>
    152. 

  152. </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><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span 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class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br></div></div><p><a href="https://codepen.io/gaearon/pen/WZpxpz?editors=0010" target="_blank" rel="noopener noreferrer"><strong>在 CodePen 上尝试</strong><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> <div class="custom-block note"><p class="custom-block-title">笔记</p> <ol><li>父组件给所有子组件传入state的值</li> <li>子组件修改值时调用父组件的方法并把值传出</li> <li>父组件接收到值之后修改state</li> <li>state被修改之后重新执行render函数，并回到第1步</li></ol></div> <h3 id="小结"><a href="#小结" class="header-anchor">#</a> 小结</h3> <ul><li><p>任何可变数据应当只有一个相对应的唯一“数据源”</p> <ul><li>通常，state 都是首先添加到需要渲染数据的组件中去</li> <li>然后，如果其他组件也需要这个 state，那么你可以将它提升至这些组件的最近共同父组件中</li> <li>你应当依靠<a href="https://zh-hans.reactjs.org/docs/state-and-lifecycle.html#the-data-flows-down" target="_blank" rel="noopener noreferrer">自上而下的数据流<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>，而不是尝试在不同组件间同步 state。</li></ul></li> <li><p>“存在”于组件中的任何 state，仅有组件自己能够修改它</p></li> <li><p>如果某些数据可以由 props 或 state 推导得出，那么它就不应该存在于 state 中。（如上例中，经过tryConvert方法转换的后的值。）</p></li></ul> <h3 id="react开发者工具-debug"><a href="#react开发者工具-debug" class="header-anchor">#</a> React开发者工具（debug）</h3> <p>当你在 UI 中发现错误时，可以使用 <a href="https://github.com/facebook/react/tree/master/packages/react-devtools" target="_blank" rel="noopener noreferrer">React 开发者工具<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> 来检查问题组件的 props，并且按照组件树结构逐级向上搜寻，直到定位到负责更新 state 的那个组件。</p></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/09.状态提升.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/002db7/" class="page-nav-centre page-nav-centre-prev"><div 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