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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">3207</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/10721" title="《openstack 和hadoop的区别是什么？》" target="_blank" onclick="return recordId('',)">《openstack 和hadoop的区别是什么？》 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10721" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/10721';}else{window.open('/article/10721');}" style="cursor: pointer;">openstack和hadoop的区别是什么？（一）openstack仿照的Amazon的云，hadoop仿照的是Google的云openstack注重的是虚拟化/虚拟机及其配套的服务，hadoop注重的是海量的数据分析和处理。（二）2OpenStack主要目的是做一整套的云计算基础构架。包括云计算(Compute),网络(Network)，对象存贮(ObjectStore)，镜像文件存储(Image)，身份认证(Authentication)，Block</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 09:27:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3207</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/19.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">3207</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/1840" title="Visual Leak Detector for Visual C++ 2008/201" target="_blank" onclick="return recordId('',)">Visual Leak Detector for Visual C++ 2008/201 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1840" 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/1840';}else{window.open('/article/1840');}" style="cursor: pointer;">VisualLeakDetectorforVisualC++2008/2010/2012VisualLeakDetectorforVisualC++2008/2010/2012ProjectDescriptionVisualLeakDetectorisafree,robust,open-sourcememoryleakdetectionsystemforVisualC++.It'sprettyeasytouse.Afterinstallingit,youj</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 01:32:41</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3205</span></span>  </p> </article><article class="excerpt"> <header> <a title="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/934" title="ActiveReports 报表控件官方中文入门教程 (1)-" target="_blank" onclick="return recordId('',)">ActiveReports 报表控件官方中文入门教程 (1)- </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/934" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/934';}else{window.open('/article/934');}" style="cursor: pointer;">原文:ActiveReports报表控件官方中文入门教程(1)-安装、激活以及产品资源本系列文章主要是面向初次接触ActiveReports产品的用户，可以帮助您在三天之内轻松的掌握ActiveReports控件的基本使用方法，包括安装、激活、创建报表、绑定数据源以及发布等内容。本篇文章我们就从安装产品开始带您开启轻松的ActiveReports体验之旅。系列文章列表：ActiveReports报表控件官方中文入门教程(2)-创建、数据源、浏览以及发布Ac</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 01:32:19</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3205</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/12.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 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