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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">3346</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/15530" title="Magento布局layout.xml文件详解" target="_blank" onclick="return recordId('',)">Magento布局layout.xml文件详解 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15530" 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/15530';}else{window.open('/article/15530');}" style="cursor: pointer;">解析顺序布局xml文件一般位于app/design/{area}/{package}/{theme}/layout/目录下。Layout文件一般包含block、reference、action三种标签。对于Magento系统，首先会将系统中相关相关的layout合并，合并一般是包括app\design\frontend\base\default\layout目录下的xml文件，以及指定的模板下面的对应的layout文件。最终普通网页合并之后的从defaul</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 22:29:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3346</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/17.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">3346</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/14.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 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">3346</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/12122" title="从C/C++语言到Objective-C语言" target="_blank" onclick="return recordId('',)">从C/C++语言到Objective-C语言 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12122" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12122';}else{window.open('/article/12122');}" style="cursor: pointer;">无标题文档原文链接:http://www.yifeiyang.net/iphone-development-introduction-7-from-the-c-c-language-to-objective-c-language/Objective-C，通常写作ObjC和较少用的ObjectiveC或Obj-C，是扩充C的面向对象编程语言。所以有一定C/C++语言基础理解和掌握Objective-C也会相应的快些。这回，我们将比较着学习Objective-</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 09:30:10</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3346</span></span>  </p> </article><article class="excerpt"> <header> <a title="MySql" class="label label-important zj-del-target" href="/category/47">MySql<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6032" title="php示例代码之使用list函数和mysql_fetch_row函" target="_blank" onclick="return recordId('',)">php示例代码之使用list函数和mysql_fetch_row函 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6032" 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/6032';}else{window.open('/article/6032');}" style="cursor: pointer;"><?php//连接参数$host="localhost";$user="root";$pwd="111111";$db="test";$linkID=mysql_connect($host,$user,$pwd);//创建一个mysql连接if(!$linkID){echo"<fontcolor='red'>unabletoconnect!</font>";}mysql_select_db($db)ordie("unabletoselectdatabase</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 01:52:40</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3346</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/1618" title="Ubuntu下deb包的安装方法" target="_blank" onclick="return recordId('',)">Ubuntu下deb包的安装方法 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1618" 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/1618';}else{window.open('/article/1618');}" style="cursor: pointer;">deb是debianlinus的安装格式，跟redhat的rpm很类似，最主要的安装命令是：dpkg-ifile.debdpkg是DebianPackage的简写，是为Debian专门开发的套件管理系统，方便软件的安装、更新及移除。全部源自Debian的Linux发行版都使用dpkg，比如Ubuntu、Knoppix等。下面是一些Dpkg的普通使用方法：1、dpkg-i<package.deb>安装一个Debian软件包，如你手动下载的文件。2、dpkg-</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 01:32:34</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3346</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/email/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/email/1/p/192">上一页</a></li> <li><a href="/search/email/1/p/191">191</a></li><li><a href="/search/email/1/p/192">192</a></li><li class="active"><span>193</span></li><li><a href="/search/email/1/p/194">194</a></li><li><a href="/search/email/1/p/195">195</a></li> <li class="next-page"><a 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