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JavaScript 的性能优化：加载和执行

概览无论当前JavaScript代码是内嵌还是在外链文件中，页面的下载和渲染都必须停下来等待脚本执行完成。JavaScript执行过程耗时越久，浏览器等待响应用户输入的时间就越长。浏览器在下载和执行脚本时出现阻塞的原因在于，脚本可能会改变页面或JavaScript的命名空间，它们对后面页面内容造成影响。一个典型的例子就是在页面中使用document.write()。例如清单1清单1JavaScript代码内嵌示例Sou</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:50:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2978</span></span>  </p> </article><article class="excerpt"> <header> <a title="Jquery" class="label label-important zj-del-target" href="/category/65">Jquery<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3833" title="jQuery ajax —— Baidu ajax" target="_blank" onclick="return recordId('',)">jQuery ajax —— Baidu ajax </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3833" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/3833';}else{window.open('/article/3833');}" style="cursor: pointer;">你没有看错标题，本文的确是在讲Baiduajax，不过是很久很久以前的版本了。由于jQueryajax模块有800+行，而核心函数jQuery.ajax就有380+行，直接分析这段代码很容易被代码逻辑弄晕。所以我们先分析一段简单的ajax代码，来自早期的百度七巧板项目。通过这个来先复习一遍ajax的知识。baidu.ajax.request分离版/***发送一个ajax请求*@author:allstar,erik,berg*@nameajax.reque</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:33:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2978</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20435" title="用JavaScript获取页面上被选中的文字的技巧" target="_blank" onclick="return recordId('',)">用JavaScript获取页面上被选中的文字的技巧 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20435" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/20435';}else{window.open('/article/20435');}" style="cursor: pointer;">这里介绍的一个小技巧是如何用JavaScript获取页面上被选中的文字的方法。最关键的JavaScriptAPI是：event.selection=window.getSelection();这里的selection实际上是个对象，但如果我们使用.toString()或强行转化成字符串，我们将得到被选中的文字。$(document).ready(function(){$(".contenttext").mouseup(function(e){vartxt;</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 23:32:32</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2977</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14012" title="eclipse Errors running builder 'JavaScript V" target="_blank" onclick="return recordId('',)">eclipse Errors running builder 'JavaScript V </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14012" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/13.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14012';}else{window.open('/article/14012');}" style="cursor: pointer;">跑java程序时提示错误：Errorsoccurredduringthebuild.Errorsrunningbuilder'JavaScriptValidator'onproject'......'.java.lang.NullPointerException导致计算机运行速度很慢，因此想取消关于js校验的工作。提高eclipse运行的速度。解决方法：项目—-右键Properties—-Builders—-取消“JavaScriptValidator”e</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:10:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2977</span></span>  </p> </article><article class="excerpt"> <header> <a title="C#" class="label label-important zj-del-target" href="/category/43">C#<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/9448" title="C#中利用FileSystemWatcher对单个文件内容的监视" target="_blank" onclick="return recordId('',)">C#中利用FileSystemWatcher对单个文件内容的监视 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9448" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/7.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/9448';}else{window.open('/article/9448');}" style="cursor: pointer;">在项目中需要用FileSystemWatcher对单个文件内容进行监视，文件中每添加一行则需要Fire相应的事件，代码如下publicclassCommandWatcher{publiceventEventHandler<CommandEventArgs>CommandHandler;Fields#regionFieldsprivatestringfileName;privateFileSystemWatcherwatcher;privateSystem.</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:26:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2977</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3988" title="今天开始学习ASP.net,ConfigurationManager提示" target="_blank" onclick="return recordId('',)">今天开始学习ASP.net,ConfigurationManager提示 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3988" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/8.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/3988';}else{window.open('/article/3988');}" style="cursor: pointer;">在web.config中配置了数据库的连接串，但是在程中用ConfigurationManager提示找不到，无法使用，网上查了半天原来是要在程序中引用System.Configuration空间.呵呵，问题解决.例如：usingSystem;usingSystem.Collections;usingSystem.Collections.Specialized;usingSystem.Data;usingSystem.Data.SqlClient;usin</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa 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