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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">3108</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/14151" title="Scott Mitchell 的ASP.NET 2.0数据教程之73：保" target="_blank" onclick="return recordId('',)">Scott Mitchell 的ASP.NET 2.0数据教程之73：保 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14151" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/14.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14151';}else{window.open('/article/14151');}" style="cursor: pointer;">本文英文原版及代码下载：http://www.asp.net/learn/data-access/tutorial-73-cs.aspxScottMitchell的ASP.NET2.0数据教程之73：保护连接字符串及其它设置信息导言：ASP.NET应用程序的设置信息通常都存储在一个名为Web.config的XML文件里。在教程的前面部分我们已经好几次修改过Web.config文件了.比如在第一章，我们创建名为Northwind的数据集时，数据库连接字符串信</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 22:12:27</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3108</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/13836" title="JavaScript 计时器,倒计时" target="_blank" onclick="return recordId('',)">JavaScript 计时器,倒计时 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13836" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13836';}else{window.open('/article/13836');}" style="cursor: pointer;">先看效果//列表的的效果//单个效果varbjtimer={sysTime:0,//服务器时间毫秒数timeBodyName:"timecontainer",//显示时间的容器timeBodyTag:"div",showFmt:"dd天HH时mm分ss秒",notstartMsg:"即将开始:",startingMsg:"剩余时间:",afterStart:"活动进行中",//开始后的内容afterEnd:"活动已结束",//结束后是否设置提示内容stim</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 22:08:39</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3108</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/17534" title="10款Flash和Javascript网页音乐播放器" target="_blank" onclick="return recordId('',)">10款Flash和Javascript网页音乐播放器 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17534" 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/17534';}else{window.open('/article/17534');}" style="cursor: pointer;">关联：9FreshjQueryMediaPlayers10款音乐播放器，有基于javascript的网页音乐播放器，也有基于Flash的音乐播放器。赶快挑一款，分享你喜爱的音乐吧！1.DewplayerDewplayer是一个微型，免费的Flashmp3播放器，具有简洁的界面。Dewplayer包含三种不同的尺寸界面。2.NiftyPlayerNiftyPlayer是一个非常小（4KB），开源的FlashMP3播放器。拥有非常简洁的界面。可以利用JavaS</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 22:54:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3107</span></span>  </p> </article><article class="excerpt"> <header> <a title="C++" class="label label-important zj-del-target" href="/category/42">C++<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/15949" title="C/C++使用命令参数介绍" target="_blank" onclick="return recordId('',)">C/C++使用命令参数介绍 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15949" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15949';}else{window.open('/article/15949');}" style="cursor: pointer;">我们从写第一个HelloWorld程序时，就开始使用main函数。后来学到Windows编程，又开始使用WinMain函数。我们都知道每个程序都得有个主函数入口。今天就简单介绍一下我们使用主函数时给它传入命令参数。很早以前就想写了，但是一直没有找到合适的地方。今天碰到项目中的一个问题，便想起了这块儿。。我们通常写控制台main都没有带参数，因为我们很少用到。这个命令参数的功能呢就会涉及到里面的参数。可以这样定义：intmain(intargc,char*a</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 22:34:59</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3107</span></span>  </p> </article><article class="excerpt"> <header> <a title="Hadoop" class="label label-important zj-del-target" href="/category/60">Hadoop<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/2173" title="Hadoop MultipleOutputs 结果输出到多个文件夹" target="_blank" onclick="return recordId('',)">Hadoop MultipleOutputs 结果输出到多个文件夹 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2173" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/2173';}else{window.open('/article/2173');}" style="cursor: pointer;">如题：出现下图中的情况（设置reduceNum=5）感觉很奇怪，排除了很久，终于发现是一个第二次犯的错误：丢了这句this.mOutputs.close();加上这句，一切恢复正常！HadoopMultipleOutputs结果输出到多个文件夹出现数据不全，部分文件为空</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 01:32:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3107</span></span>  </p> </article><article class="excerpt"> <header> <a title="操作系统" class="label label-important zj-del-target" href="/category/34">操作系统<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/682" title="无法解决 equal to 操作中 "SQL_Latin1_General" target="_blank" onclick="return recordId('',)">无法解决 equal to 操作中 "SQL_Latin1_General </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/682" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/682';}else{window.open('/article/682');}" style="cursor: pointer;">无法解决equalto操作中"SQL_Latin1_General_CP1_CI_AS"和"Chinese_PRC_CI_AS"之间的排序规则冲突。CannotresolvethecollationconflictbetweenSQL_Latin1_General_CP1_CI_ASandFinnish_Swedish_CI_ASintheequaltooperation.工作中，从国外得到一个MSSQLServer2005的备份文件，打算把他还原到本地服</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 01:32:12</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3106</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/20018" title="ASP.NET1.1下TreeView海量数据绑定" target="_blank" onclick="return recordId('',)">ASP.NET1.1下TreeView海量数据绑定 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20018" 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/20018';}else{window.open('/article/20018');}" style="cursor: pointer;">如何实现将上万条数据绑定到微软的TreeView控件上.？下面给出一个解决方法。很简单以便大家参考。效果图关于TreeView的基本用法详见我前面的几篇文章。部分实现代码如下：privatevoidPage_Load(objectsender,System.EventArgse){evaluateRemotObj=(IEvaluate)Activator.GetObject(typeof(IEvaluate),System.Configuration.Co</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 23:27:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3105</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/thrift/1/p/1">首页</a></li> <li class="prev-page"><a 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