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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">3009</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/9624" title="Word和WPS插件开发总结" target="_blank" onclick="return recordId('',)">Word和WPS插件开发总结 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9624" 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/9624';}else{window.open('/article/9624');}" style="cursor: pointer;">为了实现办公的自动化，需要实现文档的自动流转。开发出的WORD和WPS插件的功能包括显示批注、隐藏批注、引入文件、附加对象、保存文档、退出应用。1Word插件开发1.1插件开发方法1.1.1开发语言开发语言的选择，可以选择C++和C#。1.1.2Visualstudio开发说明VisualStudio2010提供了各个版本Office的插件开发，新建工程-按照的模板-VisualC#-Office-2010，运行程序时其会调用本地安装的Office；文件-</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 09:26:59</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3009</span></span>  </p> </article><article class="excerpt"> <header> <a title="DB2" class="label label-important zj-del-target" href="/category/48">DB2<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7349" title="DB2事务日志" target="_blank" onclick="return recordId('',)">DB2事务日志 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7349" 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/7349';}else{window.open('/article/7349');}" style="cursor: pointer;">1、DB2数据库的日志原理事务日志记录数据库中所有对象和数据的改变，在早前版本中最大可达256G，其大小为(logprimary+logsecond)*logfilsiz，其中logprimary+logsecond的值小于或等于256，logfilsiz的最大为262144，在9.5版本中，日志最大已经可以达到512G，其中logfilsz的大小更改为524286。DB2数据库的日志分为主日志和辅助日志，其中主日志在第一个连接到达数据库或者数据库被激活后</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 01:54:03</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3009</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/20.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">3008</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/19735" title="C++学习笔记(五)--虚函数表解析" target="_blank" onclick="return recordId('',)">C++学习笔记(五)--虚函数表解析 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19735" 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/19735';}else{window.open('/article/19735');}" style="cursor: pointer;">前言C++中的虚函数的作用主要是实现了多态的机制。关于多态，简而言之就是用父类型别的指针指向其子类的实例，然后通过父类的指针调用实际子类的成员函数。这种技术可以让父类的指针有“多种形态”，这是一种泛型技术。所谓泛型技术，说白了就是试图使用不变的代码来实现可变的算法。比如：模板技术，RTTI技术，虚函数技术，要么是试图做到在编译时决议，要么试图做到运行时决议。关于虚函数的使用方法，我在这里不做过多的阐述。大家可以看看相关的C++的书籍。在这篇文章中，我只想从</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 23:23:28</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3008</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/16957" title="使用纯javascript通过className来获取元素（ge" target="_blank" onclick="return recordId('',)">使用纯javascript通过className来获取元素（ge </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16957" 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/16957';}else{window.open('/article/16957');}" style="cursor: pointer;">MarkFinklesuggestedthatIdosomespeedtesting,nowthatanativeimplementationofgetElementsByClassNamehaslandedintheMozillatrunk(destinedforFirefox3).SoIwentaroundanddugupallofthedifferent,existing,implementationsthatIcouldfind.Currently</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 22:47:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3008</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/14139" title="Mac OS X:远程执行osascript命令" target="_blank" onclick="return recordId('',)">Mac OS X:远程执行osascript命令 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14139" 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/14139';}else{window.open('/article/14139');}" style="cursor: pointer;">MacOSX:远程执行osascript命令及问题解决对于系统管理/电脑维护人员，在ApplrRemoteDesktop的管理机上可以通过图形方式远程控制网络上的每台Mac电脑,而很多时候需要发送Unix命令来完成工作。比如有时需要使用管理员帐户远程登录到每台电脑，大家普遍知道的命令是：osascript-e'tellapplication"SystemEvents"'-e'keystroke"LOGIN_NAME"'-e'keystroketab'-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 22:12:18</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3008</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/web/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/web/1/p/193">上一页</a></li> <li><a href="/search/web/1/p/192">192</a></li><li><a href="/search/web/1/p/193">193</a></li><li class="active"><span>194</span></li><li><a href="/search/web/1/p/195">195</a></li><li><a href="/search/web/1/p/196">196</a></li> <li class="next-page"><a 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