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      <a title='一个 JS 脚本实现网站预加载，提升页面加载速度' href='/2019/08/23/A24-instant.page/'><img class='thumbnail' src='https://cdn.jsdelivr.net/gh/TRHX/ImageHosting/ITRHX-PIC/thumbnail/JavaScript.png'></a>
    
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        一个 JS 脚本实现网站预加载，提升页面加载速度
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      <section class="article typo">
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          <p><a href="https://instant.page/" target="_blank" rel="noopener">instant.page</a> 使用即时预加载技术，在用户点击之前预先加载页面。当用户的鼠标悬停在一个链接上超过 65 毫秒时，浏览器会对此页面进行预加载，当用户点击链接后，就从预加载的缓存中直接读取页面内容，从而达到缩短页面加载时间的目的。</p>
<a id="more"></a>
<fancybox><br><img src="https://cdn.jsdelivr.net/gh/TRHX/ImageHosting/ITRHX-PIC/A24/01.gif" alt="演示"><br></fancybox>

<p>以我博客为例，使用了这项技术后，当鼠标在一个链接停留超过 65 毫秒时，Network 里可以看见相关文章已经预加载出来了，而停留时间过短就不会预加载（红色部分，状态为 <font color="#FF0000">canceled</font>）</p>
<p>使用方法：<br>将以下HTML代码放在&lt;/ body&gt; 之前即可：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">"//instant.page/1.2.2"</span> <span class="attr">type</span>=<span class="string">"module"</span> <span class="attr">integrity</span>=<span class="string">"sha384-2xV8M5griQmzyiY3CDqh1dn4z3llDVqZDqzjzcY+jCBCk/a5fXJmuZ/40JJAPeoU"</span>&gt;</span><span class="undefined"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>但是此脚本是官方的，储存在国外服务器，对国内访问不太友好，可以将该JS脚本储存到自己的服务器上，<a href="https://cdn.jsdelivr.net/gh/TRHX/CDN-for-itrhx.com@2.0.2/js/instantclick-1.2.2.js" target="_blank" rel="noopener">点此获取</a>该JS脚本，然后再根据以下格式在&lt;/ body&gt; 之前引用：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">"`存放路径`/instantclick-1.2.2.js"</span> <span class="attr">type</span>=<span class="string">"module"</span>&gt;</span><span class="undefined"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>也可以直接使用我的，使用 jsDeliver CDN 加速，速度还可以：<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">"https://cdn.jsdelivr.net/gh/TRHX/CDN-for-itrhx.com@2.0.2/js/instantclick-1.2.2.js"</span> <span class="attr">type</span>=<span class="string">"module"</span>&gt;</span><span class="undefined"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>参考资料：<a href="https://www.zrahh.com/archives/399.html" target="_blank" rel="noopener">《网站预加载 JS 脚本 instant.page》</a>——by 左岸  ；<a href="https://instant.page/" target="_blank" rel="noopener">instant.page官网</a></p>

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