异步加载jQuery似乎更慢

时间：2014-10-22 17:34:20

标签： javascript jquery ajax asynchronous

几个星期前，我开始修改异步加载jQuery的想法，主要是因为我们也使用了一些有点大的jQuery UI。我的想法是，不是加载三个脚本（jQuery，jQuery UI和我自己的脚本），而是每个块都解析等，我会异步加载它们。我确实使用谷歌CDN的jQuery和jQuery UI，但我正在测试假设一个新的缓存，这意味着用户可能有最长的加载时间。

我的脚本依赖于jQuery，我不能指望异步脚本按我想要的顺序运行，所以我使用一个间隔来等待jQuery可用。

这一切都很好。

问题是（令我惊讶的是）异步加载版本的页面加载速度比同步版本慢，我无法弄清楚为什么，或者我应该做些什么来改进它（如果有什么我可以做的在所有）。

我设置了一个测试页来说明问题，但我无法让它完全适用于jsfiddle（对不起）。我在谷歌浏览器中运行了所有测试。基本思路是：

  1. 在各个地方，记录当前秒/毫秒
  2. 包括：
    • 的jQuery
    • jQueryUI的
    • 在jQuery准备就绪时将被修改的一些html
    • 一堆图片来减慢页面加载速度（从谷歌随机抽取）
  3. 运行页面，观察并查看控制台中的日志备注。

    4. 我发现，当不异步加载时，页面可视加载速度更快（FOUC非常简短），日志确认更快的加载时间，通常不到一秒钟：

    • 以3：290
      • 开始页面加载
    • 在3：669
      • 启动主脚本
    • 最终页面加载为3：680
    • 在3：897等待jQuery
    • jQuery于3：898加载
    • 文件准备就绪3：898
    • END Document Ready at 3：957

    但是，当异步加载时，页面的FOUC会更长，并且日志确认jQuery等待文档准备好的时间更长：

    • 以52：460
      • 开始页面加载
    • 在52：624
      • 启动主脚本
    • 结束页面加载52：635
    • 在53:20等待jQuery
    • 在53：441等待jQuery
    • jQuery加载于53：441
    • 文件准备在54：652
    • END Document Ready at 54：795

    当异步加载时，似乎jQuery在触发doc ready之前等待加载图像，而通常它不会等待。请注意，异步版本的总加载时间超过两秒。

    我还没有解决的另一个问题是jQuery UI可能会在jQuery之前加载并运行。由于上述问题，我没有对此问题感到困扰，因为如果我不首先切换到异步负载，那将是一个没有实际意义的。

    任何人都可以开导我吗？我一定不明白这一切是如何运作的。

    这是源代码，它使用PHP在异步和常规之间切换：

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script type="text/javascript">
    var date = new Date();
    var seconds = date.getSeconds();
    var milliseconds = date.getMilliseconds();
    console.log("Start Page Load" + " at " + seconds + ":" + milliseconds);
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Testing Async jQuery</title>
<link type="text/css" rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/themes/redmond/jquery-ui.min.css">
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"<?php if ( isset( $_REQUEST["async"] ) ) { ?> async defer<?php } ?>></script>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/jquery-ui.min.js"<?php if ( isset( $_REQUEST["async"] ) ) { ?> async defer<?php } ?>></script>
<script type="text/javascript">
    var date = new Date();
    var seconds = date.getSeconds();
    var milliseconds = date.getMilliseconds();
    console.log("Start Main Script" + " at " + seconds + ":" + milliseconds);
    (function() {
        var jQueryLoading = setInterval(function() {
            var date = new Date();
            var seconds = date.getSeconds();
            var milliseconds = date.getMilliseconds();
            console.log("Waiting for jQuery" + " at " + seconds + ":" + milliseconds);
            if (typeof($) === "function") {
                clearInterval(jQueryLoading);
                var date = new Date();
                var seconds = date.getSeconds();
                var milliseconds = date.getMilliseconds();
                console.log("jQuery Loaded" + " at " + seconds + ":" + milliseconds);
                $(document).ready(function() {
                    var date = new Date();
                    var seconds = date.getSeconds();
                    var milliseconds = date.getMilliseconds();
                    console.log("Document Ready" + " at " + seconds + ":" + milliseconds);

                    $(".button").button();
                    $(".datepicker").datepicker();
                    $("#tabs,#tabsB,#tabsC").tabs();

                    var date = new Date();
                    var seconds = date.getSeconds();
                    var milliseconds = date.getMilliseconds();
                    console.log("END Document Ready" + " at " + seconds + ":" + milliseconds);
                });
            }
        }, 100);
    })();
</script>
</head>
<body>
<a class="button" href="javascript:void(0);">Random Button</a>
<br>
<input class="datepicker" type="text">
<br>
<div id="tabs">
  <ul>
    <li><a href="#tabs-1">Nunc tincidunt</a></li>
    <li><a href="#tabs-2">Proin dolor</a></li>
    <li><a href="#tabs-3">Aenean lacinia</a></li>
  </ul>
  <div id="tabs-1">
    <p>Nothing important here.</p>
  </div>
  <div id="tabs-2">
    <p>Nothing important here.</p>
  </div>
  <div id="tabs-3">
    <p>Nothing important here.</p>
  </div>
</div>
<div id="tabsB">
  <ul>
    <li><a href="#tabsB-1">Nunc tincidunt</a></li>
    <li><a href="#tabsB-2">Proin dolor</a></li>
    <li><a href="#tabsB-3">Aenean lacinia</a></li>
  </ul>
  <div id="tabsB-1">
    <p>Nothing important here.</p>
  </div>
  <div id="tabsB-2">
    <p>Nothing important here.</p>
  </div>
  <div id="tabsB-3">
    <p>Nothing important here.</p>
  </div>
</div>
<div id="tabsC">
  <ul>
    <li><a href="#tabsC-1">Nunc tincidunt</a></li>
    <li><a href="#tabsC-2">Proin dolor</a></li>
    <li><a href="#tabsC-3">Aenean lacinia</a></li>
  </ul>
  <div id="tabsC-1">
    <p>Nothing important here.</p>
  </div>
  <div id="tabsC-2">
    <p>Nothing important here.</p>
  </div>
  <div id="tabsC-3">
    <p>Nothing important here.</p>
  </div>
</div>
<p>
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