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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">3180</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/16318" title="Websphere 集群 Session 内存到内存复制" target="_blank" onclick="return recordId('',)">Websphere 集群 Session 内存到内存复制 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16318" 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/16318';}else{window.open('/article/16318');}" style="cursor: pointer;">HTTP协议本身是“连接-请求-应答-关闭连接”的模式，是一种无状态协议；然而随着web动态化的需求，我们往往需要把两次连续的请求关联起来，从而使得客户端和服务端的会话变得有状态。Session就是满足这种需求的一种实现方式。它的基本原理是服务器端为每一个session管理一份会话信息数据。而客户端和服务器端依靠一个全局唯一标示符——sessionID来访问会话信息数据。当用户访问web应用时，服务器端会先检查客户端的请求里是否包含sessionID，如果</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 22:39:41</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3180</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/14931" title="JS 文本输入框放大镜效果" target="_blank" onclick="return recordId('',)">JS 文本输入框放大镜效果 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14931" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14931';}else{window.open('/article/14931');}" style="cursor: pointer;">JS文本输入框放大镜效果今天下午研究了下"文本输入框放大镜效果"当然KISSY官网也有这种组件请看kissydemo其实这种效果对于很多童鞋来说应该并不陌生！我今年最早也是在12306官网抢票中添加联系人要填写电话号码中看到这种效果！如下图所示：所以今天下午也就研究下这个，特此分享出来给大家！也做了一个简单的DEMOjSFiddle链接地址如下：JSFiddle链接：想要查看效果！请轻轻的点击我！基本原理：其实基本原理也很简单！通过JS不断的监听输入框值的</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 22:22:01</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3180</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/12284" title="20个HTML5视频播放器及代码" target="_blank" onclick="return recordId('',)">20个HTML5视频播放器及代码 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12284" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12284';}else{window.open('/article/12284');}" style="cursor: 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">3180</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/20.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 class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3180</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/12199" title="微软新推TypeScript取代JavaScript" target="_blank" onclick="return recordId('',)">微软新推TypeScript取代JavaScript </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12199" 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/12199';}else{window.open('/article/12199');}" style="cursor: pointer;">微软新推TypeScript取代JavaScriptTypeScript是一个应用程序级的JavaScript开发语言。TypeScript是JavaScript的超集，可以编译成纯JavaScript。TypeScript跨浏览器、跨操作系统、跨主机，开源。主页：http://www.typescriptlang.org/StartsfromJavaScript,EndswithJavaScriptTypeScript遵循JavaScript的语法和语义</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 09:30:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3179</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/11644" title="Openmeetings安装详细步骤" target="_blank" onclick="return recordId('',)">Openmeetings安装详细步骤 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11644" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11644';}else{window.open('/article/11644');}" style="cursor: pointer;">Openmeetings安装Openmeetings安装Openmeetings官方主页http://code.google.com/p/openmeetings/。安装过程参照http://code.google.com/p/openmeetings/wiki/InstallationOfRelease05http://code.google.com/p/openmeetings/wiki/BuildSourcesOpenmeetings是一个网络视频会</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 09:29:52</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3179</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/nginx/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/nginx/1/p/187">上一页</a></li> <li><a href="/search/nginx/1/p/186">186</a></li><li><a href="/search/nginx/1/p/187">187</a></li><li class="active"><span>188</span></li><li><a href="/search/nginx/1/p/189">189</a></li><li><a href="/search/nginx/1/p/190">190</a></li> <li class="next-page"><a 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