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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">3000</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/16957" title="使用纯javascript通过className来获取元素（ge" target="_blank" onclick="return recordId('',)">使用纯javascript通过className来获取元素（ge </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16957" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/7.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/16957';}else{window.open('/article/16957');}" style="cursor: pointer;">MarkFinklesuggestedthatIdosomespeedtesting,nowthatanativeimplementationofgetElementsByClassNamehaslandedintheMozillatrunk(destinedforFirefox3).SoIwentaroundanddugupallofthedifferent,existing,implementationsthatIcouldfind.Currently</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 22:47:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3000</span></span>  </p> </article><article class="excerpt"> <header> <a title="Jquery" class="label label-important zj-del-target" href="/category/65">Jquery<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3833" title="jQuery ajax —— Baidu ajax" target="_blank" onclick="return recordId('',)">jQuery ajax —— Baidu ajax </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3833" 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/3833';}else{window.open('/article/3833');}" style="cursor: pointer;">你没有看错标题，本文的确是在讲Baiduajax，不过是很久很久以前的版本了。由于jQueryajax模块有800+行，而核心函数jQuery.ajax就有380+行，直接分析这段代码很容易被代码逻辑弄晕。所以我们先分析一段简单的ajax代码，来自早期的百度七巧板项目。通过这个来先复习一遍ajax的知识。baidu.ajax.request分离版/***发送一个ajax请求*@author:allstar,erik,berg*@nameajax.reque</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 01:33:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3000</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/15531" title="iOS App的图标，启动画面及其它" target="_blank" onclick="return recordId('',)">iOS App的图标，启动画面及其它 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15531" 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/15531';}else{window.open('/article/15531');}" style="cursor: pointer;">注意：最新的图标尺寸和文件名规格以Apple的文档为准：TechnicalQ&AQA1686:AppIconsoniPadandiPhone。其中要注意，iTunesArtWork这项不用写入Info.plist的Iconfiles。这点Apple的文档加粗说明了。图标的圆角和光晕效果圆角效果。图标的圆角效果是系统自动加上的，我们不能控制。这也是为什么我们看到的每个图标，其圆角效果是完全相同的。光晕效果。光晕效果也是系统加上的，和“圆角”不同的是，光晕效果</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 22:29:50</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2999</span></span>  </p> </article><article class="excerpt"> <header> <a title="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/10577" title="【thrift】vc中使用thrift中文字符串乱码问题解" target="_blank" onclick="return recordId('',)">【thrift】vc中使用thrift中文字符串乱码问题解 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10577" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/10577';}else{window.open('/article/10577');}" style="cursor: pointer;">问题描述：VC中使用Apachethrift时，如果字符串中包含中文，会出现乱码问题，这个问题的原因是由于thrift为了达到跨语言交互而使用了UTF-8格式发送字符串，这点对java或者C#不会造成影响，但是在VC中UTF-8却很成问题。VC中的string编码随项目编码一般是multibytes或者unicode，虽然倡导使用unicode，但实际上使用multibytes多字节开发仍然广泛存在，下面的解决方案主要解决的是多字节下的乱码问题。解决方案1</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 09:27:31</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2999</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8284" title="sqlldr日期格式" target="_blank" onclick="return recordId('',)">sqlldr日期格式 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8284" 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/8284';}else{window.open('/article/8284');}" style="cursor: pointer;">日期格式终止等OPTIONS(direct=true,ERRORS=50,skip=0,rows=10000,readsize=20971520,bindsize=20971520)Loaddatainfile'input.txt'"str'****@@@@'"truncateintotableaction_cfieldsterminatedby'@#$'optionallyenclosedby'%%%%%'(ACTION_ID,TimeDATE'YYYY</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 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