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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">3623</span></span>  </p> </article><article class="excerpt"> <header> <a title="IOS" class="label label-important zj-del-target" href="/category/58">IOS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/15538" title="君正4750开发板使用日记6-uCOS(minios)的开发配" target="_blank" onclick="return recordId('',)">君正4750开发板使用日记6-uCOS(minios)的开发配 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15538" 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/15538';}else{window.open('/article/15538');}" style="cursor: pointer;">大半年没有搞君正的开发板了，最近总算有机会再试试JZ4750的uc/osII配置。也在此做个记录，供参阅。ucos要在linux环境下编译，我仍是在windows下用VMWareUbuntuServer910虚拟机，用Putty连接登录后执行命令。我一开始并没有拿到了JZ4750的ucos的SDK（随机光盘上只有一个可烧录的DEMO），于是从君正官网的FTP里下载了Jz-uCOS-Development-guide.pdf、mipsel-4.1.2-nop</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 22:29:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3623</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12149" title="Android+struts2+JSON方式的手机开发" target="_blank" onclick="return recordId('',)">Android+struts2+JSON方式的手机开发 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12149" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12149';}else{window.open('/article/12149');}" style="cursor: pointer;">在手机的后台服务无论是调用WebService还是Http请求，多数都是采用Android的HttpClient实现相关的调用实现。本文实现Android+Struts2+JSON方式实现为手机前台提供服务。涉及的知识点：1.Struts2框架的搭建(包括Struts2的jSON插件)2.Android前台访问Web采用HttpClient方式。3.Android采用JSON的解析。功能：模拟远程登录流程：手机后台服务：由于采用Struts2的JSON响应</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 09:30:11</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3623</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/11691" title="Ext.ux.UploadDialog.Dialog Ext上传" target="_blank" onclick="return recordId('',)">Ext.ux.UploadDialog.Dialog Ext上传 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11691" 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/11691';}else{window.open('/article/11691');}" style="cursor: pointer;">今天做项目做了个上传的功能，不过遇到好多问题，先在这做个笔记。。。。先引入Java代码<linkrel="stylesheet"type="text/css"href="<%=path%>/css/ext-all.css"/><scripttype="text/javascript"src="<%=path%>/js/ext-base.js"></script><scripttype="t</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 09:29:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3623</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/11150" title="扩展 HTMLParser 对自定义标签的处理能力" target="_blank" onclick="return recordId('',)">扩展 HTMLParser 对自定义标签的处理能力 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11150" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11150';}else{window.open('/article/11150');}" style="cursor: pointer;">文档选项<scripttype="text/javascript"></script>打印本页<noscript></noscript><scripttype="text/javascript"></script>将此页作为电子邮件发送<noscript></noscript> </p> </article><article class="excerpt"> <header> <a title="CSS" class="label label-important zj-del-target" href="/category/68">CSS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/2512" title="图解div+css命名规则" target="_blank" onclick="return recordId('',)">图解div+css命名规则 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2512" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/2512';}else{window.open('/article/2512');}" style="cursor: pointer;">一个好的命名习惯对一个网页制作人员来说可以提高代码修改的效率及代码的可读性，本图是彦磊根据自己的习惯整理而成，希望和大家交流，每个人的习惯不一样，不一下完全按照这样的规则来但一定要有自己的一套规则。图解div+css命名规则</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 01:32:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3623</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/22160" title="轻量级B/S应用开发引擎：NoahWeb" target="_blank" onclick="return recordId('',)">轻量级B/S应用开发引擎：NoahWeb </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/22160" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/22160';}else{window.open('/article/22160');}" style="cursor: pointer;">同事介绍，说一款BS开发引擎比较强大，处理表单之类的比较不错，今天找来看看。网址：http://www.noahweb.net/帮助：http://docs.noahweb.net/看看他们网站上怎么介绍的：//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////</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 23:54:03</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3622</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/5.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">3622</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/javap/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/javap/1/p/185">上一页</a></li> <li><a href="/search/javap/1/p/184">184</a></li><li><a href="/search/javap/1/p/185">185</a></li><li class="active"><span>186</span></li><li><a href="/search/javap/1/p/187">187</a></li><li><a href="/search/javap/1/p/188">188</a></li> <li class="next-page"><a href="/search/javap/1/p/187">下一页</a></li> <li><a href="/search/javap/1/p/2924">末页</a></li> <li><span>共 2924页,共29234条</span></li> </ul> </div> </div> </div>   <style type="text/css"> .d_postlist .text { /* height: 30px; */ display: block; /* height: 100%; */ font-size:14px !important; width:85%; } .zj-dynamic-info li{ margin: 10px 3px; } .zj-dynamic-info .zj-a{ color: blue; cursor: pointer; } </style> <aside class="sidebar"> <div class="widget d_postlist"> <div class="title"> <h2>站内搜索</h2> </div> <ul> <li><div class="zj-search-box zj-pc-search-box"> <form class="searchform themeform" role="form" action="/search" method="get"> <input style="font-size: 120%; margin-top: 10px;" type="ext" class="search" name="search_word" placeholder="搜索从这里开始..." value=""> <i class="fa fa-search"></i> <button class="btn btn-primary" type="button" style="margin-left: -4px;height: 36px !important;"> <span class="zj-icon-text">搜索</span> </button> </form> </div></li> </ul> </div>    <div class="widget d_postlist"> <div class="title"> <h2>加入交流</h2> </div> <ul> <li class="zj-no-wx-app"><a target="_blank" href="//shang.qq.com/wpa/qunwpa?idkey=f6d1df60dbb7ebc94c2c8a67b1e094e1e90677df1e943d9547d425b81bb218a5"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/qq-qun.png" alt=""></span><span class="text">1. 手机QQ扫左侧二维码</span><span class="text">2. 搜Q群：542395358</span> <span class="text">3. 点击<img style="cursor: pointer;" 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