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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">3206</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14933" title="【Android 开发教程】保存到外部存储设备（SD卡" target="_blank" onclick="return recordId('',)">【Android 开发教程】保存到外部存储设备（SD卡 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14933" 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/14933';}else{window.open('/article/14933');}" style="cursor: pointer;">本章节翻译自《Beginning-Android-4-Application-Development》，如有翻译不当的地方，敬请指出。原书购买地址http://www.amazon.com/Beginning-Android-4-Application-Development/dp/1118199545/上一节介绍了如何把文件存储到内部设备。有的时候，需要把文件存储到外部存储设备，比如SD卡。因为SD卡具有更大的存储空间，同时也可以很容易的和其他用户分享这</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 22:22:02</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3206</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11644" title="Openmeetings安装详细步骤" target="_blank" onclick="return recordId('',)">Openmeetings安装详细步骤 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11644" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/17.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11644';}else{window.open('/article/11644');}" style="cursor: pointer;">Openmeetings安装Openmeetings安装Openmeetings官方主页http://code.google.com/p/openmeetings/。安装过程参照http://code.google.com/p/openmeetings/wiki/InstallationOfRelease05http://code.google.com/p/openmeetings/wiki/BuildSourcesOpenmeetings是一个网络视频会</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 09:29:52</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3206</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/18012" title="asp.net控件开发基础(1)" target="_blank" onclick="return recordId('',)">asp.net控件开发基础(1) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18012" 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/18012';}else{window.open('/article/18012');}" style="cursor: pointer;">asp.net本身提供了很多控件,提供给我们这些比较懒惰的人使用,我认为控件的作用就在此,因为我们不想重复工作,所以要创建它,这个本身便是一个需求的关系,所以学习控件开发很有意思.wrox网站上有本书ProfessionalASP.NET2.0ServerControlandComponentDevelopment现在还没有出版,但网站上放出了代码,所以正好下载过来学习一下.我看过前几章代码,环环相扣,作者用不同的知识向我们展示同一个效果,所以循序渐进的学</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 23:00:52</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3204</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/12199" title="微软新推TypeScript取代JavaScript" target="_blank" onclick="return recordId('',)">微软新推TypeScript取代JavaScript </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12199" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/20.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12199';}else{window.open('/article/12199');}" style="cursor: pointer;">微软新推TypeScript取代JavaScriptTypeScript是一个应用程序级的JavaScript开发语言。TypeScript是JavaScript的超集，可以编译成纯JavaScript。TypeScript跨浏览器、跨操作系统、跨主机，开源。主页：http://www.typescriptlang.org/StartsfromJavaScript,EndswithJavaScriptTypeScript遵循JavaScript的语法和语义</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 09:30:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3204</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/9805" title="C#操作Word完全功略！" target="_blank" onclick="return recordId('',)">C#操作Word完全功略！ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9805" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/2.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/9805';}else{window.open('/article/9805');}" style="cursor: pointer;">【摘自】http://tmsoft.lsxy.com/trackback.php?tbID=334&extra=2aa67d周老师科研站前提：导入COM库：Microsoftword11.0ObjectLibrary.引用里面就增加了：创建新WordobjectoMissing=System.Reflection.Missing.Value;Word._ApplicationoWord;Word._DocumentoDoc;oWord=newWord.Ap</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 09:27:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3204</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/21061" title="Registering JavaScript object methods as cal" target="_blank" onclick="return recordId('',)">Registering JavaScript object methods as cal </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21061" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/21061';}else{window.open('/article/21061');}" style="cursor: pointer;">RegisteringJavaScriptobjectmethodsascallbacksNovember27,2007Tags:ajaxTheregistrationofcallbackfunctionsisverycommoninJavaScriptwebprogramming,forexampletoattachuserinterfaceeventhandlers(suchasonclick),ortoprovideafunctiontohandle</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 23:40:15</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3203</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/impala/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/impala/1/p/188">上一页</a></li> <li><a href="/search/impala/1/p/187">187</a></li><li><a href="/search/impala/1/p/188">188</a></li><li class="active"><span>189</span></li><li><a href="/search/impala/1/p/190">190</a></li><li><a href="/search/impala/1/p/191">191</a></li> <li class="next-page"><a 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