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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">3445</span></span>  </p> </article><article class="excerpt"> <header> <a title="PHP" class="label label-important zj-del-target" href="/category/64">PHP<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/9297" title="PHP memcache" target="_blank" onclick="return recordId('',)">PHP memcache </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9297" 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/9297';}else{window.open('/article/9297');}" style="cursor: pointer;">windows环境：添加服务.sccreateMemcachedserver11212binpath="C:\memcache\memcached.exe-drunservice-m500-p11212"start=autodisplayname="Memcachedserver(11212)"要是一台机有多个,那就改下端口再搞一次撒~php使用Memcache函数库是在PECL(PHPExtensionCommunityLibrary)中，主要作用是搭建</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 09:26:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3445</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/747" title="《BI项目笔记》SSAS部署时发生的问题——元数据" target="_blank" onclick="return recordId('',)">《BI项目笔记》SSAS部署时发生的问题——元数据 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/747" 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/747';}else{window.open('/article/747');}" style="cursor: pointer;">原文:《BI项目笔记》SSAS部署时发生的问题——元数据管理器中存在错误解决办法在生成和部署期间出错。是否继续？解决办法：用MicrosoftSQLServerManagementStudio连接AnalysisServices然后删除多维数据库，重新布署。这样就OK的。《BI项目笔记》SSAS部署时发生的问题——元数据管理器中存在错误解决办法</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 01:32:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3445</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/14933" title="【Android 开发教程】保存到外部存储设备（SD卡" target="_blank" onclick="return recordId('',)">【Android 开发教程】保存到外部存储设备（SD卡 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14933" 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/14933';}else{window.open('/article/14933');}" style="cursor: pointer;">本章节翻译自《Beginning-Android-4-Application-Development》，如有翻译不当的地方，敬请指出。原书购买地址http://www.amazon.com/Beginning-Android-4-Application-Development/dp/1118199545/上一节介绍了如何把文件存储到内部设备。有的时候，需要把文件存储到外部存储设备，比如SD卡。因为SD卡具有更大的存储空间，同时也可以很容易的和其他用户分享这</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 22:22:02</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3444</span></span>  </p> </article><article class="excerpt"> <header> <a title="Java" class="label label-important zj-del-target" href="/category/41">Java<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11520" title="Java中运行时内存结构补充" target="_blank" onclick="return recordId('',)">Java中运行时内存结构补充 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11520" 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/11520';}else{window.open('/article/11520');}" style="cursor: pointer;">Java中运行时内存结构<wbr><wbr></wbr></wbr>1.1方法区：<wbr></wbr>方法区是系统分配的一个内存逻辑区域，是JVM在装载类文件时，用于存储类型信息的(类的描述信息)。<wbr></wbr>方法区存放的信息包括：<wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr>1.1.1类的基本信息：每个类的全限定名每个类的直接超类的全限定名(可约束类型转换)</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 09:29:48</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3444</span></span>  </p> </article><article class="excerpt"> <header> <a title="Python" class="label label-important zj-del-target" href="/category/44">Python<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/30347" title="python 将列表中的字符串转为数字" target="_blank" onclick="return recordId('',)">python 将列表中的字符串转为数字 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30347" 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/30347';}else{window.open('/article/30347');}" style="cursor: pointer;">python将列表中的字符串转为数字转自：https://www.jb51.net/article/86561.htm本文实例讲述了Python中列表元素转为数字的方法。分享给大家供大家参考，具体如下：有一个数字字符的列表：1numbers=['1','5','10','8']想要把每个元素转换为数字：1numbers=[1,5,10,8]用一个循环来解决：1234new_numbers=[];forninnumbers:new_numbers.appen</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">2019-09-27 17:56:24</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3443</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20459" title="ASP.NET服务器控件开发（3）--事件和回传数据的" target="_blank" onclick="return recordId('',)">ASP.NET服务器控件开发（3）--事件和回传数据的 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20459" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/20459';}else{window.open('/article/20459');}" style="cursor: pointer;">前两篇介绍了服务器控件的基本显示，属性的设定，继承Webcontrol开发控件等内容，这篇介绍下定制服务器控件的事件的处理和回传数据的处理。当ASP.NET页面处理回传到服务器端的表单时，两种信息会传递给页面中的控件：回传事件，如Button一类控件触发的回传，会引发服务器端事件；回传数据：是Web表单中包含的数据，该数据是在Web表单提交到服务器端时传递给如TextBox一类的控件。处理回传数据PostBack（回传）：ASP.NET控件提交表单到服务器</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 23:32:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3443</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/myeclipse/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/myeclipse/1/p/187">上一页</a></li> <li><a href="/search/myeclipse/1/p/186">186</a></li><li><a href="/search/myeclipse/1/p/187">187</a></li><li class="active"><span>188</span></li><li><a href="/search/myeclipse/1/p/189">189</a></li><li><a href="/search/myeclipse/1/p/190">190</a></li> <li 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