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                                <h1 id="&#x5E38;&#x7528;&#x529F;&#x80FD;&#x6536;&#x96C6;">&#x5E38;&#x7528;&#x529F;&#x80FD;&#x6536;&#x96C6;</h1>
<h4 id="&#x6D4F;&#x89C8;&#x5668;&#x57FA;&#x672C;&#x4FE1;&#x606F;&#x5224;&#x65AD;">&#x6D4F;&#x89C8;&#x5668;&#x57FA;&#x672C;&#x4FE1;&#x606F;&#x5224;&#x65AD;</h4>
<pre><code class="lang-javascript">  <span class="hljs-comment">/*
  * &#x667A;&#x80FD;&#x673A;&#x6D4F;&#x89C8;&#x5668;&#x7248;&#x672C;&#x4FE1;&#x606F;:
  *
  */</span>
  <span class="hljs-keyword">var</span> browser = {
    versions: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
      <span class="hljs-keyword">var</span> u = navigator.userAgent, app = navigator.appVersion;
      <span class="hljs-built_in">console</span>.log(u);
      <span class="hljs-keyword">return</span> {<span class="hljs-comment">//&#x79FB;&#x52A8;&#x7EC8;&#x7AEF;&#x6D4F;&#x89C8;&#x5668;&#x7248;&#x672C;&#x4FE1;&#x606F;</span>
        trident: u.indexOf(<span class="hljs-string">&apos;Trident&apos;</span>) &gt; <span class="hljs-number">-1</span>, <span class="hljs-comment">//IE&#x5185;&#x6838;</span>
        presto: u.indexOf(<span class="hljs-string">&apos;Presto&apos;</span>) &gt; <span class="hljs-number">-1</span>, <span class="hljs-comment">//opera&#x5185;&#x6838;</span>
        webKit: u.indexOf(<span class="hljs-string">&apos;AppleWebKit&apos;</span>) &gt; <span class="hljs-number">-1</span>, <span class="hljs-comment">//&#x82F9;&#x679C;&#x3001;&#x8C37;&#x6B4C;&#x5185;&#x6838;</span>
        gecko: u.indexOf(<span class="hljs-string">&apos;Gecko&apos;</span>) &gt; <span class="hljs-number">-1</span> &amp;&amp; u.indexOf(<span class="hljs-string">&apos;KHTML&apos;</span>) == <span class="hljs-number">-1</span>, <span class="hljs-comment">//&#x706B;&#x72D0;&#x5185;&#x6838;</span>
        mobile: !!u.match(<span class="hljs-regexp">/Mobile/g</span>), <span class="hljs-comment">//&#x53BB;&#x6389;&#x6D4F;&#x89C8;&#x5668;&#x5185;&#x6838;&#x5224;&#x65AD;</span>
<span class="hljs-comment">//        mobile: !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/), //&#x662F;&#x5426;&#x4E3A;&#x79FB;&#x52A8;&#x7EC8;&#x7AEF;</span>
        ios: !!u.match(<span class="hljs-regexp">/\(i[^;]+;( U;)? CPU.+Mac OS X/</span>), <span class="hljs-comment">//ios&#x7EC8;&#x7AEF;</span>
        android: u.indexOf(<span class="hljs-string">&apos;Android&apos;</span>) &gt; <span class="hljs-number">-1</span> || u.indexOf(<span class="hljs-string">&apos;Linux&apos;</span>) &gt; <span class="hljs-number">-1</span>, <span class="hljs-comment">//android&#x7EC8;&#x7AEF;&#x6216;&#x8005;uc&#x6D4F;&#x89C8;&#x5668;</span>
        iPhone: u.indexOf(<span class="hljs-string">&apos;iPhone&apos;</span>) &gt; <span class="hljs-number">-1</span> || u.indexOf(<span class="hljs-string">&apos;Mac&apos;</span>) &gt; <span class="hljs-number">-1</span>, <span class="hljs-comment">//&#x662F;&#x5426;&#x4E3A;iPhone&#x6216;&#x8005;QQHD&#x6D4F;&#x89C8;&#x5668;</span>
        iPad: u.indexOf(<span class="hljs-string">&apos;iPad&apos;</span>) &gt; <span class="hljs-number">-1</span>, <span class="hljs-comment">//&#x662F;&#x5426;iPad</span>
        webApp: u.indexOf(<span class="hljs-string">&apos;Safari&apos;</span>) == <span class="hljs-number">-1</span> <span class="hljs-comment">//&#x662F;&#x5426;web&#x5E94;&#x8BE5;&#x7A0B;&#x5E8F;&#xFF0C;&#x6CA1;&#x6709;&#x5934;&#x90E8;&#x4E0E;&#x5E95;&#x90E8;</span>
      };
    }(),
    language: (navigator.browserLanguage || navigator.language).toLowerCase()
  }
  <span class="hljs-built_in">document</span>.writeln(<span class="hljs-string">&quot;&#x8BED;&#x8A00;&#x7248;&#x672C;: &quot;</span> + browser.language);
  <span class="hljs-built_in">document</span>.writeln(<span class="hljs-string">&quot; &#x662F;&#x5426;&#x4E3A;&#x79FB;&#x52A8;&#x7EC8;&#x7AEF;: &quot;</span> + browser.versions.mobile);
  <span class="hljs-built_in">document</span>.writeln(<span class="hljs-string">&quot; &#x662F;&#x5426;&#x4E3A;webKit: &quot;</span> + browser.versions.webKit);
  <span class="hljs-built_in">document</span>.writeln(<span class="hljs-string">&quot; ios&#x7EC8;&#x7AEF;: &quot;</span> + browser.versions.ios);
  <span class="hljs-built_in">document</span>.writeln(<span class="hljs-string">&quot; android&#x7EC8;&#x7AEF;: &quot;</span> + browser.versions.android);
  <span class="hljs-built_in">document</span>.writeln(<span class="hljs-string">&quot; &#x662F;&#x5426;&#x4E3A;iPhone: &quot;</span> + browser.versions.iPhone);
  <span class="hljs-built_in">document</span>.writeln(<span class="hljs-string">&quot; &#x662F;&#x5426;iPad: &quot;</span> + browser.versions.iPad);
  <span class="hljs-built_in">document</span>.writeln(navigator.userAgent);
</code></pre>
<h4 id="javascriptjquery&#x5224;&#x65AD;&#x5143;&#x7D20;&#x5373;&#x5C06;&#x51FA;&#x73B0;&#x5728;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x6216;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x7684;&#x9876;&#x90E8;">JavaScript|jQuery&#x5224;&#x65AD;&#x5143;&#x7D20;&#x5373;&#x5C06;&#x51FA;&#x73B0;&#x5728;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x6216;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x7684;&#x9876;&#x90E8;</h4>
<pre><code class="lang-javascript"><span class="hljs-comment">/* JavaScript&#x5224;&#x65AD;&#x5143;&#x7D20;&#x5373;&#x5C06;&#x51FA;&#x73B0;&#x5728;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x6216;&#x79BB;&#x5F00;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;.
&#x4E00;&#x3001;&#x5224;&#x65AD;&#x5143;&#x7D20;&#x662F;&#x5426;&#x5904;&#x4E8E;&#x53EF;&#x89C6;&#x6587;&#x6863;&#x533A;&#x57DF;&#x9876;&#x90E8;
&#x5224;&#x65AD;&#x6761;&#x4EF6;:DOMTop.offsetTop + clientHeight - 10 &lt; clientHeight + scrollTop
&#x89E3;&#x6790;:
  &#x83B7;&#x53D6;&#x5143;&#x7D20;&#x8DDD;&#x79BB;&#x6587;&#x6863;&#x9876;&#x7AEF;&#x7684;&#x957F;&#x5EA6;,&#x7136;&#x540E;&#x4E0E;&#x7A97;&#x53E3;&#x7684;&#x9AD8;&#x5EA6;&#x76F8;&#x52A0;;
  &#x63A5;&#x7740;,&#x518D;&#x901A;&#x8FC7;&#x83B7;&#x53D6;&#x7A97;&#x53E3;&#x6EDA;&#x52A8;&#x6761;&#x9876;&#x7AEF;&#x4E0E;&#x6587;&#x6863;&#x9876;&#x7AEF;&#x7684;&#x8DDD;&#x79BB;;
  &#x5E76;&#x901A;&#x8FC7;&#x5224;&#x65AD;&#x5F97;&#x5230;&#x5143;&#x7D20;&#x662F;&#x5426;&#x5904;&#x4E8E;,&#x8DDD;&#x79BB;&#x53EF;&#x89C6;&#x6587;&#x6863;&#x533A;&#x57DF;&#x7684;&#x9876;&#x90E8;10&#x4E2A;&#x5355;&#x4F4D;&#x7684;&#x4F4D;&#x7F6E;.
&#x4E8C;&#x3001;&#x5224;&#x65AD;&#x5143;&#x7D20;&#x662F;&#x5426;&#x5373;&#x5C06;&#x51FA;&#x73B0;&#x5728;&#x53EF;&#x89C6;&#x7A97;&#x53E3;&#x7684;&#x5E95;&#x90E8;
&#x5224;&#x65AD;&#x6761;&#x4EF6;:DOMTop.offsetTop -10 &lt; clientHeight + scrollTop
&#x89E3;&#x6790;:&#x57FA;&#x672C;&#x601D;&#x8DEF;&#x540C;&#x4E0A;&#x4E00;&#x81F4;.
 */</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">init</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">var</span> DOMTop = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;box&apos;</span>);
  <span class="hljs-built_in">document</span>.addEventListener(<span class="hljs-string">&apos;scroll&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">var</span> clientHeight = <span class="hljs-built_in">document</span>.documentElement.clientHeight;
    <span class="hljs-keyword">var</span> scrollTop = <span class="hljs-built_in">document</span>.documentElement.scrollTop;
    <span class="hljs-keyword">if</span> (DOMTop.offsetTop + clientHeight - <span class="hljs-number">10</span> &lt; clientHeight + scrollTop) {
      <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x53D1;&#x73B0;&#x5143;&#x7D20;&apos;</span>)
    }
  })
}

<span class="hljs-built_in">window</span>.onload = init;
<span class="hljs-comment">// delete init();</span>


<span class="hljs-comment">/*jQuery&#x5224;&#x65AD;&#x5143;&#x7D20;&#x5373;&#x5C06;&#x51FA;&#x73B0;&#x5728;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x6216;&#x79BB;&#x5F00;&#x6587;&#x6863;&#x53EF;&#x89C6;&#x533A;&#x57DF;.
&#x601D;&#x8DEF;&#x540C;&#x4E0A;&#x4E00;&#x81F4;,&#x8868;&#x8FBE;&#x65B9;&#x5F0F;&#x4E0D;&#x540C;
 &#x5F53;&#x5143;&#x7D20;&#x8DDD;&#x79BB;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x8FD8;&#x6709;10&#x7684;&#x957F;&#x5EA6;&#x65F6;,&#x6267;&#x884C;&#x76F8;&#x5173;&#x7A0B;&#x5E8F;*/</span>
<span class="hljs-comment">/*$(document).ready(function () {
  $(window).scroll(function () {
    // console.log($(window).scrollTop() +  $(window).height())
    // &#x6587;&#x6863;&#x8DDD;&#x79BB;&#x5C4F;&#x5E55;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x7684;&#x8DDD;&#x79BB;
    var DOMTop = $(&apos;.box&apos;).offset().top + 10;
    // &#x6587;&#x6863;&#x5DF2;&#x7ECF;&#x6ED1;&#x52A8;&#x7684;&#x8DDD;&#x79BB; + &#x7A97;&#x53E3;&#x7684;&#x9AD8;&#x5EA6;
    var DOMScrollHeight = $(window).scrollTop() +  $(window).height();
    // &#x5143;&#x7D20;&#x8DDD;&#x79BB;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x9876;&#x90E8;&#x8DDD;&#x79BB;&#x4E3A;10&#x7684;&#x65F6;&#x5019;&#x89E6;&#x53D1;
    if (DOMTop &lt; DOMScrollHeight) {
      console.log(&apos;DOMTop&apos; + DOMTop);
      console.log(&apos;DOMScrollHeight&apos; + DOMScrollHeight);
    }
  });
});*/</span>
</code></pre>
<h4 id="&#x5BFC;&#x822A;&#x6761;&#x52A8;&#x753B;&#xFF0C;&#x8BBE;&#x5B9A;">&#x5BFC;&#x822A;&#x6761;&#x52A8;&#x753B;&#xFF0C;&#x8BBE;&#x5B9A;</h4>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">navAnimation</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">let</span> DOMTop = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;nav&apos;</span>), <span class="hljs-comment">// &#x83B7;&#x53D6;&#x5BFC;&#x822A;&#x5BF9;&#x8C61;</span>
    clientHeight = <span class="hljs-built_in">document</span>.documentElement.clientHeight, <span class="hljs-comment">// &#x83B7;&#x53D6;&#x7A97;&#x53E3;&#x53EF;&#x89C6;&#x533A;&#x57DF;&#x9AD8;&#x5EA6;</span>
    tru = <span class="hljs-literal">true</span>,  <span class="hljs-comment">// &#x662F;&#x5426;&#x66FF;&#x6362;&#x7C7B;&#x540D;&#x7684;&#x4F9D;&#x636E;</span>
    clientHeightScrollTop = clientHeight + DOMTop.offsetTop + DOMTop.clientHeight; <span class="hljs-comment">// &#x662F;&#x5426;&#x66FF;&#x6362;&#x7C7B;&#x540D;&#x7684;&#x4F9D;&#x636E;</span>
  <span class="hljs-comment">// &#x76D1;&#x542C;&#x6587;&#x6863;&#x6EDA;&#x52A8;&#x6761;&#x4E8B;&#x4EF6;&#xFF0C;&#x7ED1;&#x5B9A;&#x52A8;&#x753B;</span>
  <span class="hljs-built_in">document</span>.addEventListener(<span class="hljs-string">&apos;scroll&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">let</span> scrollTop = <span class="hljs-literal">null</span>;
    <span class="hljs-keyword">if</span> (<span class="hljs-built_in">document</span>.body.scrollTop !== <span class="hljs-number">0</span>) {
      scrollTop = <span class="hljs-built_in">document</span>.body.scrollTop
    } <span class="hljs-keyword">else</span> {
      scrollTop = <span class="hljs-built_in">document</span>.documentElement.scrollTop
    }
    <span class="hljs-keyword">if</span> (tru &amp;&amp; clientHeightScrollTop &lt; clientHeight + scrollTop) {
      DOMTop.setAttribute(<span class="hljs-string">&apos;class&apos;</span>, <span class="hljs-string">&apos;page-nav top&apos;</span>);
      tru = <span class="hljs-literal">false</span>
    }
    <span class="hljs-keyword">if</span> (clientHeightScrollTop &gt; clientHeight + scrollTop) {
      DOMTop.setAttribute(<span class="hljs-string">&apos;class&apos;</span>, <span class="hljs-string">&apos;page-nav&apos;</span>);
      tru = <span class="hljs-literal">true</span>
    }
  }, <span class="hljs-literal">false</span>);
}
</code></pre>
<h4 id="&#x951A;&#x94FE;&#x63A5;&#x8DF3;&#x8F6C;&#x8FC7;&#x6E21;">&#x951A;&#x94FE;&#x63A5;&#x8DF3;&#x8F6C;&#x8FC7;&#x6E21;</h4>
<pre><code class="lang-javascript"><span class="hljs-comment">/*
# &#x951A;&#x94FE;&#x63A5;&#x8DF3;&#x8F6C;&#x8FC7;&#x5EA6;
&#x6761;&#x4EF6;&#xFF1A;
  1.&#x76EE;&#x6807;&#x4F4D;&#x7F6E; &amp; &#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E; &#x8DDD;&#x79BB;&#x8FC7;&#x8FD1;
  2.&#x76EE;&#x6807;&#x4F4D;&#x7F6E; &gt; &#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E;
  3.&#x76EE;&#x6807;&#x4F4D;&#x7F6E; &lt; &#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E;
&#x7B56;&#x7565;&#xFF1A;
  1.&#x83B7;&#x53D6;&#x9700;&#x8981;&#x7ED1;&#x5B9A;&#x4E8B;&#x4EF6;&#x7684;&#x5BF9;&#x8C61;&#xFF1B;
  2.&#x4F7F;&#x7528;for&#x5FAA;&#x73AF;&#x8BED;&#x53E5;&#xFF0C;&#x7ED9;&#x83B7;&#x53D6;&#x5230;&#x7684;&#x5BF9;&#x8C61;&#x96C6;&#x5408;&#x7ED1;&#x5B9A;&#x4E8B;&#x4EF6;&#xFF1B;
  3.window.scrollTo(X,Y); &#x5907;&#x6CE8;&#xFF1A;X=window&#x6C34;&#x5E73;&#x65B9;&#x5411;&#x7684;&#x6EDA;&#x52A8;&#x6761;&#x79FB;&#x52A8;&#x4F4D;&#x7F6E;&#xFF1B;Y=window&#x6C34;&#x5E73;&#x65B9;&#x5411;&#x7684;&#x6EDA;&#x52A8;&#x6761;&#x79FB;&#x52A8;&#x4F4D;&#x7F6E;;
  4.&#x6839;&#x636E;&#x6761;&#x4EF6;&#xFF0C;&#x6267;&#x884C;&#x4E0D;&#x540C;&#x4E8B;&#x4EF6;&#x3002;
  5.&#x83B7;&#x53D6;`&#x76EE;&#x6807;&#x4F4D;&#x7F6E; &amp; &#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E;`&#x7684;&#x95F4;&#x8DDD;&#xFF0C;&#x9664;&#x4EE5;25&#x3002;&#x7136;&#x540E;&#x7528;&#x8BE5;&#x6570;&#x503C;&#x4E0E;`&#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E;`&#x76F8;&#x52A0;&#x6216;&#x76F8;&#x51CF;&#x3002;&#x800C;&#x7D2F;&#x52A0;&#x6216;&#x7D2F;&#x51CF;&#x7684;&#x8FC7;&#x7A0B;&#x901A;&#x8FC7;setInterval()&#x5B9A;&#x65F6;&#x5668;&#x65B9;&#x6CD5;&#x6765;&#x63A7;&#x5236;&#x3002;
  6.&#x7A0B;&#x5E8F;&#x6267;&#x884C;&#x5B8C;&#x6BD5;&#x4E4B;&#x540E;&#xFF0C;&#x7528;clearInterval()&#x65B9;&#x6CD5;&#x6E05;&#x9664;&#x5B9A;&#x65F6;&#x5668;&#x3002;
 */</span>
anchorLinkJumpTransition();

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">anchorLinkJumpTransition</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">let</span> aTag = <span class="hljs-built_in">document</span>.querySelectorAll(<span class="hljs-string">&apos;.animation-top a&apos;</span>);
  <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">0</span>; i &lt; aTag.length; i++) {
    aTag[i].addEventListener(<span class="hljs-string">&apos;click&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
      <span class="hljs-keyword">var</span> $target = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-keyword">this</span>.hash.slice(<span class="hljs-number">1</span>));
      scrollToTop($target.offsetTop);

      <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">scrollToTop</span>(<span class="hljs-params">scrollDuration</span>) </span>{
        <span class="hljs-keyword">let</span> scrollTop = <span class="hljs-literal">null</span>, <span class="hljs-comment">// &#x6EDA;&#x52A8;&#x6761;&#x5F53;&#x524D;&#x4F4D;&#x7F6E;</span>
          scrollStep = <span class="hljs-literal">null</span>, <span class="hljs-comment">// &#x6EDA;&#x52A8;&#x6761;&#x7D2F;&#x52A0;&#x524D;&#x7684;&#x4F4D;&#x7F6E;</span>
          s = <span class="hljs-number">0</span>; <span class="hljs-comment">// &#x5173;&#x95ED;&#x8BA1;&#x65F6;&#x5668;&#x7684;&#x6761;&#x4EF6; s = 25&#x65F6;</span>
        <span class="hljs-keyword">if</span> (<span class="hljs-built_in">document</span>.body.scrollTop !== <span class="hljs-number">0</span>) {
          scrollTop = <span class="hljs-built_in">document</span>.body.scrollTop
        } <span class="hljs-keyword">else</span> {
          scrollTop = <span class="hljs-built_in">document</span>.documentElement.scrollTop
        }
        scrollStep = scrollTop = <span class="hljs-built_in">Number</span>.parseInt(scrollTop);
        <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x6EDA;&#x52A8;&#x524D;&#xFF0C;&#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E;:&apos;</span> + scrollTop);
        <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x76EE;&#x6807;&#x4F4D;&#x7F6E;&#xFF1A;&apos;</span> + scrollDuration);
        <span class="hljs-comment">// &#x76EE;&#x6807;&#x4F4D;&#x7F6E; &amp; &#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E; &#x8DDD;&#x79BB;&#x8FC7;&#x8FD1;</span>
        <span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">Math</span>.abs(scrollTop - scrollDuration))
        <span class="hljs-keyword">if</span> (<span class="hljs-built_in">Math</span>.abs(scrollTop - scrollDuration) &gt; <span class="hljs-number">21</span>) {
          <span class="hljs-keyword">let</span> scrollInterval = setInterval(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
            <span class="hljs-keyword">if</span> (s &lt; <span class="hljs-number">26</span>) {
              <span class="hljs-comment">// s &#x662F;&#x7D2F;&#x52A0;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x7528;&#x6765;&#x8DDF;`&#x76EE;&#x6807;&#x4F4D;&#x7F6E; &amp; &#x6EDA;&#x52A8;&#x6761;&#x4F4D;&#x7F6E;`&#x7684;&#x95F4;&#x8DDD;&#xFF0C;&#x76F8;&#x4E58;&#xFF0C;&#x83B7;&#x5F97;&#x8FC7;&#x6E21;&#x6548;&#x679C;&#x3002;</span>
              <span class="hljs-built_in">window</span>.scrollTo(<span class="hljs-number">0</span>, scrollStep + (scrollDuration - scrollTop) / <span class="hljs-number">25</span> * s);
              s++;
            }
            <span class="hljs-keyword">else</span> {
              clearInterval(scrollInterval);
              scrollStep = <span class="hljs-literal">null</span>;
            }
          }, <span class="hljs-number">10</span>);
        }
      }
    }, <span class="hljs-literal">false</span>);
  }
}
</code></pre>
<h4 id="&#x6587;&#x7AE0;&#x6807;&#x9898;&#x7684;&#x52A8;&#x753B;">&#x6587;&#x7AE0;&#x6807;&#x9898;&#x7684;&#x52A8;&#x753B;</h4>
<pre><code class="lang-Javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">animateIn</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">let</span> animateIn = <span class="hljs-built_in">document</span>.querySelectorAll(<span class="hljs-string">&apos;.container .title strong&apos;</span>);
  <span class="hljs-comment">// console.log(animateIn.getAttribute(&apos;class&apos;))</span>
  <span class="hljs-comment">// console.log(animateIn)</span>
  <span class="hljs-keyword">let</span> that = <span class="hljs-literal">null</span>;
  <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">0</span>; i &lt; animateIn.length; i++) {
    animateIn[i].addEventListener(<span class="hljs-string">&apos;click&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
      <span class="hljs-keyword">if</span> (that !== <span class="hljs-literal">null</span>) {
        that.removeAttribute(<span class="hljs-string">&apos;class&apos;</span>);
        <span class="hljs-keyword">if</span> (that === <span class="hljs-keyword">this</span>) {
          <span class="hljs-keyword">this</span>.removeAttribute(<span class="hljs-string">&apos;class&apos;</span>);
          that = <span class="hljs-literal">null</span>;
          <span class="hljs-keyword">return</span>;
        }
      }
      <span class="hljs-keyword">this</span>.setAttribute(<span class="hljs-string">&apos;class&apos;</span>, <span class="hljs-string">&apos;animate-in&apos;</span>);
      that = <span class="hljs-keyword">this</span>;
    })
  }
}
</code></pre>

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