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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">3235</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/15027" title="NetBeans 时事通讯（刊号 # 69 - Aug 19, 2009）" target="_blank" onclick="return recordId('',)">NetBeans 时事通讯（刊号 # 69 - Aug 19, 2009） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15027" 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/15027';}else{window.open('/article/15027');}" style="cursor: pointer;">刊号#69-Aug19,2009社区Netbeans中文社区每周时讯发布项目您正在阅读的这篇NetBeans每周时事通讯，由中文社区成员<scripttype="text/javascript"></script>gnehzuil<noscript><ahr</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 22:23:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3235</span></span>  </p> </article><article class="excerpt"> <header> <a title="Ubuntu" class="label label-important zj-del-target" href="/category/55">Ubuntu<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/9677" title="[RK_2014_0920]ubuntu下，使用ldconfig解决：er" target="_blank" onclick="return recordId('',)">[RK_2014_0920]ubuntu下，使用ldconfig解决：er </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9677" 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/9677';}else{window.open('/article/9677');}" style="cursor: pointer;">一、问题描述编写一个与libpcap有关的程序：test_libpcap.cpp，编译test_libpcap.o成功。注：之前已经成功安装libpcap，libpcap.so.1.5.3的路径是：/home/test/work/lib；test_libpcap.cpp的路径是/home/test/work/test_libpcap。运行test_libpcap.o出现以下提示：test_libpcap.o:errorwhileloadingsharedl</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 09:27:01</span></span> <span 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pointer;">MyDB为待修复的数据库名称USEMASTERGOSP_CONFIGURE'ALLOWUPDATES',1RECONFIGUREWITHOVERRIDEGOALTERDATABASEMyDBSETEMERGENCYGOsp_dboption'MyDB','singleuser','true'GODBCCCHECKDB('MyDB','REPAIR_ALLOW_DATA_LOSS')GOALTERDATABASEMyDBSETONLINEGOsp_confi</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 01:32:18</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3235</span></span>  </p> </article><article class="excerpt"> <header> <a title="Ubuntu" class="label label-important zj-del-target" href="/category/55">Ubuntu<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/21553" title="how to install jdk on ubuntu" target="_blank" onclick="return recordId('',)">how to install jdk on ubuntu </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21553" 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/21553';}else{window.open('/article/21553');}" style="cursor: pointer;">apt-getinstallsun-java6-jdksun-java6-jre有点习惯于用命令行安装的方式了，省得去网上找页面下载，还要找迅雷下什么的，配上好的源挺省事的不过配置环境变量还是熟悉，费了些功夫，PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"LANG="zh_CN.UTF-8"LANGUAGE="zh_CN:zh:en_US:en"C</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 23:46:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3234</span></span>  </p> </article><article class="excerpt"> <header> <a title="IOS" class="label label-important zj-del-target" href="/category/58">IOS<i 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pointer;">ThelatestVMwarePlayer4.0.3failstoinstallinUbuntu12.04(withLinuxKernel3.2.x)duetoaVirtualNetworkDeviceerror,butyoucangetittoworkusingapatch.Here'showtodoit.InstallVMwarePlayerinUbuntu12.04PrecisePangolin(LinuxKernel3.2)1.DownloadVM</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 22:10:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3234</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/scala/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/scala/1/p/189">上一页</a></li> <li><a href="/search/scala/1/p/188">188</a></li><li><a href="/search/scala/1/p/189">189</a></li><li class="active"><span>190</span></li><li><a href="/search/scala/1/p/191">191</a></li><li><a href="/search/scala/1/p/192">192</a></li> <li class="next-page"><a 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