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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>JavaScript文章</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/a61298/" class="sidebar-link">33个非常实用的JavaScript一行代码</a></li><li><a href="/blog/pages/8143cc480faf9a11/" class="sidebar-link">new命令原理</a></li><li><a href="/blog/pages/b1af5cb8996363c5/" class="sidebar-link">ES5面向对象</a></li><li><a href="/blog/pages/1f4123be6f45abcd/" class="sidebar-link">ES6面向对象</a></li><li><a href="/blog/pages/e808fba1fa8fbab2/" class="sidebar-link">多种数组去重性能对比</a></li><li><a href="/blog/pages/40b4db2d38ba85f2/" class="sidebar-link">JS随机打乱数组</a></li><li><a href="/blog/pages/40f623be692cf8bc/" class="sidebar-link">判断是否为移动端浏览器</a></li><li><a href="/blog/pages/f1acb712033ac8da/" class="sidebar-link">将一维数组按指定长度转为二维数组</a></li><li><a href="/blog/pages/0f6a0ac99b62ede5/" aria-current="page" class="active sidebar-link">防抖与节流函数</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/0f6a0ac99b62ede5/#防抖函数" class="sidebar-link">防抖函数</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/0f6a0ac99b62ede5/#封装" class="sidebar-link">封装</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/blog/pages/0f6a0ac99b62ede5/#节流函数" class="sidebar-link">节流函数</a><ul 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right"></span></p> <!----></section></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>学习笔记</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/web/#前端" data-v-06970110>前端</a></li><li data-v-06970110><a href="/blog/web/#JavaScript文章" data-v-06970110>JavaScript文章</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>2020-02-29</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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">防抖与节流函数<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="防抖与节流函数"><a href="#防抖与节流函数" class="header-anchor">#</a> 防抖与节流函数</h1> <p>防抖和节流的作用都是在高频事件中防止函数被多次调用，是一种性能优化的方案。</p> <p>区别在于，防抖函数只会在高频事件结束后n毫秒调用一次函数，节流函数会在高频事件触发过程当中每隔n毫秒调用一次函数。</p> <h2 id="防抖函数"><a href="#防抖函数" class="header-anchor">#</a> 防抖函数</h2> <p>触发高频事件后一段时间（wait）只会执行一次函数，如果指定时间（wait）内高频事件再次被触发，则重新计算时间。</p> <h3 id="封装"><a href="#封装" class="header-anchor">#</a> 封装</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">// 防抖函数</span>
    26. 

  26. <span class="token keyword">function</span> <span class="token function">debounce</span><span class="token punctuation">(</span><span class="token parameter">func<span class="token punctuation">,</span> wait</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    27. 

  27.     <span class="token keyword">let</span> timeout <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
    28. 

  28.     <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    29. 

  29.         <span class="token keyword">let</span> context <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    30. 

  30.         <span class="token keyword">let</span> args <span class="token operator">=</span> arguments<span class="token punctuation">;</span>
    31. 

  31.         <span class="token keyword">if</span> <span class="token punctuation">(</span>timeout<span class="token punctuation">)</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timeout<span class="token punctuation">)</span><span class="token punctuation">;</span>
    32. 

  32.         timeout <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    33. 

  33.             <span class="token function">func</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span>
    34. 

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

  35.     <span class="token punctuation">}</span>
    36. 

  36. <span class="token punctuation">}</span>
    37. 

  37. </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></div></div><h2 id="节流函数"><a href="#节流函数" class="header-anchor">#</a> 节流函数</h2> <p>规定在一个单位时间内，只能触发一次函数。如果这个单位时间内触发多次函数，只有一次生效</p> <h3 id="封装-2"><a href="#封装-2" class="header-anchor">#</a> 封装</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">// 节流函数</span>
    38. 

  38. <span class="token keyword">function</span> <span class="token function">throttle</span><span class="token punctuation">(</span><span class="token parameter">func<span class="token punctuation">,</span> wait</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    39. 

  39.     <span class="token keyword">let</span> timeout <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
    40. 

  40.     <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    41. 

  41.         <span class="token keyword">let</span> context <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    42. 

  42.         <span class="token keyword">let</span> args <span class="token operator">=</span> arguments<span class="token punctuation">;</span>
    43. 

  43.         <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>timeout<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    44. 

  44.             timeout <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    45. 

  45.                 timeout <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
    46. 

  46.                 <span class="token function">func</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span>
    47. 

  47.             <span class="token punctuation">}</span><span class="token punctuation">,</span> wait<span class="token punctuation">)</span>
    48. 

  48.         <span class="token punctuation">}</span>
    49. 

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

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

  51. </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></div></div><h2 id="应用场景"><a href="#应用场景" class="header-anchor">#</a> 应用场景</h2> <p>常见的应用场景都是使用高频事件来调用函数的过程当中，比如应用于window对象的resize、scroll事件，拖拽时的mousemove事件，文字输入、自动完成的keyup事件。</p> <h3 id="防抖应用场景"><a href="#防抖应用场景" class="header-anchor">#</a> 防抖应用场景</h3> <ul><li>scroll事件滚动触发事件</li> <li>搜索框输入查询，如果用户一直在输入中，没有必要不停地调用去请求服务端接口，等用户停止输入的时候，再调用，设置一个合适的时间间隔，有效减轻服务端压力。</li> <li>表单验证</li> <li>按钮提交事件。</li> <li>浏览器窗口缩放，resize事件(如窗口停止改变大小之后重新计算布局)等。</li></ul> <h3 id="节流的应用场景"><a href="#节流的应用场景" class="header-anchor">#</a> 节流的应用场景</h3> <ul><li>DOM 元素的拖拽功能实现（mousemove）</li> <li>搜索联想（keyup）</li> <li>计算鼠标移动的距离（mousemove）</li> <li>Canvas 模拟画板功能（mousemove）</li> <li>射击游戏的 mousedown/keydown 事件（单位时间只能发射一颗子弹）</li> <li>监听滚动事件判断是否到页面底部自动加载更多</li></ul> <h2 id="示例"><a href="#示例" class="header-anchor">#</a> 示例</h2> <p data-height="600" data-theme-id="light" data-default-tab="result" data-user="heBody" data-slug-hash="QWbgLMP" data-pen-title="防抖与节流函数" class="codepen" style="height:600px;box-sizing:border-box;display:flex;align-items:center;justify-content:center;border:2px solid;margin:1em 0;padding:1em;"><span>See the Pen <a href="https://codepen.io/heBody/pen/QWbgLMP">
    52. 

  52.   防抖与节流函数</a> by heBody (<a href="https://codepen.io/heBody">@heBody</a>)
    53. 

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  57.             Git修改分支名
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  58.             <!----></div></a> <span class="date">08-11</span></dt></dl><dl><dd>02</dd> <dt><a href="/blog/pages/55f894/"><div>
    59. 

  59.             CSS给table的tbody添加滚动条
    60. 

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    61. 

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    62. 

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    63. 

  63.               原创
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