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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">3229</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/15211" title="利用BeanUtils在对象间复制属性" target="_blank" onclick="return recordId('',)">利用BeanUtils在对象间复制属性 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15211" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/3.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15211';}else{window.open('/article/15211');}" style="cursor: pointer;">commons-beanutils是jakartacommons子项目中的一个软件包，其主要目的是利用反射机制对JavaBean的属性进行处理。我们知道，一个JavaBean通常包含了大量的属性，很多情况下，对JavaBean的处理导致大量get/set代码堆积，增加了代码长度和阅读代码的难度（你的薪水按代码行数计算？那千万别让老板看到此帖哦）BeanUtils是这个包里比较常用的一个工具类，这里只介绍它的copyProperties()方法。该方法定义如</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 22:25:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3229</span></span>  </p> </article><article class="excerpt"> <header> <a title="VMware" class="label label-important zj-del-target" href="/category/54">VMware<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/13952" title="How To Install VMware Player In Ubuntu 12.04" target="_blank" onclick="return recordId('',)">How To Install VMware Player In Ubuntu 12.04 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13952" 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/13952';}else{window.open('/article/13952');}" style="cursor: 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 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pointer;">太给力了，20个100%Html5播放器来了。浏览器不需要加载flash和ActiveX，就可以渲染视频，可以很简单的播放视频和控制视频。这些播放器代码同样支持flash，当用户浏览器不支持html5或是其他情况时，视频可以保证正常播放。1.HTML5VideoPlayer:MediaElement.js2.JavascriptDrivenHTML5VideoPlayer:Dplayer3.HTML5Audio,VideoandImageGallery:M</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 09:30:16</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3229</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/finereport/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/finereport/1/p/188">上一页</a></li> <li><a href="/search/finereport/1/p/187">187</a></li><li><a href="/search/finereport/1/p/188">188</a></li><li class="active"><span>189</span></li><li><a href="/search/finereport/1/p/190">190</a></li><li><a href="/search/finereport/1/p/191">191</a></li> 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