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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">3677</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/9761" title="Ubuntu下修改tomcat6默认的8080端口" target="_blank" onclick="return recordId('',)">Ubuntu下修改tomcat6默认的8080端口 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9761" 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/9761';}else{window.open('/article/9761');}" style="cursor: pointer;">$sudovi/etc/tomcat6/server.xml将<Connectorport="8080"protocol="HTTP/1.1"connectionTimeout="20000"URIEncoding="UTF-8"redirectPort="8443"/>修改为<Connectorport="8081".../>之后运行如下命令重启tomcat6服务即可：$sudoservicetomcat6restart如果新的端口号小于1024，如修改</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 09:27:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3677</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/21517" title="Set up Ubuntu 12.04 Laptop as WiFi Hotspot (" target="_blank" onclick="return recordId('',)">Set up Ubuntu 12.04 Laptop as WiFi Hotspot ( </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21517" 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/21517';}else{window.open('/article/21517');}" style="cursor: pointer;">Imadeatutorialshowing“HowtoMakeanUbuntuLaptopasaWiFiHotspot”before.ThepostisactuallyforUbuntu10.04.SincetheUbuntu12.04LTS(PrecisePangolin)isreleased,thereisabitproblemtoimplementthesamepurposefollowingthesetupfromthattutorial.Inth</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 23:45:53</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3676</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/16140" title="C++转向C#的疑惑：难道C#中没有拷贝构造函数？" target="_blank" onclick="return recordId('',)">C++转向C#的疑惑：难道C#中没有拷贝构造函数？ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16140" 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/16140';}else{window.open('/article/16140');}" style="cursor: pointer;">不可否认，C++在过去十年乃至现在一直都是windows平台上的主流开发语言，而来势凶猛的.NET势必开辟一个崭新的局面，从目前的种种迹象来看，.NET是大势所趋，而C#作为.NET平台上的第一开发语言自然备受关注，于是有很多程序员纷纷转向C#，这其中当然不乏C++程序员。情况往往是这样，从一种语言过渡到另一种语言，哪怕是比较相似的语言，程序员也经常无意识地陷入原开发语言的思维定势，这样的结果通常只有一个，那就是导致连程序员自己也始终想不通的错误。本文由某</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 22:37:25</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3676</span></span>  </p> </article><article class="excerpt"> <header> <a title="SqlServer" class="label label-important zj-del-target" href="/category/46">SqlServer<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7521" title="SQL SERVER 2012 第三章 T-SQL 基本语句 having" target="_blank" onclick="return recordId('',)">SQL SERVER 2012 第三章 T-SQL 基本语句 having </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7521" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/8.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7521';}else{window.open('/article/7521');}" style="cursor: pointer;">SELECTManagerIDASManager,COUNT(*)ASReportsFROMHuman.Resources.Employee2WHEREEmployeeID!=5GROUPBYManagerIDHAVINGCOUNT(*)>3;having是聚合以后算的，很棒。where是聚合以前算的。用FORXML子句可以输出XML格式。ALLDISTINCT的用法。SQLSERVER2012第三章T-SQL基本语句having子句</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 01:54:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3676</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/30299" title="递推最小二乘法——python程序" target="_blank" onclick="return recordId('',)">递推最小二乘法——python程序 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30299" 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/30299';}else{window.open('/article/30299');}" style="cursor: pointer;">算法引用的数据为python自带的波士顿房价数据。代码如下：#data第一列为标记值#data后几列为特征向量#initialTheta为需要求得的thetaimportnumpyasnpimportsklearn.datasetsfromsklearn.model_selectionimporttrain_test_splitfromsklearn.metricsimportmean_squared_errorimportmatplotlibasmpli</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 17:56:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3675</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/18505" title="XML文件DTD路径解析问题（in Eclipse）" target="_blank" onclick="return recordId('',)">XML文件DTD路径解析问题（in Eclipse） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18505" 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/18505';}else{window.open('/article/18505');}" style="cursor: pointer;">原文出自：http://51dev.com/program/java/1/20070818/10971.html1、xml文件声明dtd文件路径如下：字串7"http://java.sun.com/dtd/ejb-jar_2_0.dtd"><ejb-jar><br>。。。。。。<br></ejb-jar>2、dtd声明解析原则：字串4DOCTYPE声明不仅包含常规关键字和根元素名称，而且包含指示外部DTD源关键字和DTD位置。XML规范定义了几种声明源方法</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">2019-08-29 23:07:18</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3675</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/18108" title="WebBrowser 控件概述" target="_blank" onclick="return recordId('',)">WebBrowser 控件概述 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18108" 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/18108';}else{window.open('/article/18108');}" style="cursor: pointer;">出处:http://msdn2.microsoft.com/zh-cn/library/w290k23d(VS.80).aspx全部折叠<styletype="text/css">.vb,.cs,.cpp,.nu{display:none;}</style><styleid="LanguageSpecificTextStyle"type="text/css">.nu{display:inline;}</style>ThispageisspecifictoM</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 23:02:08</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3675</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/10.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> 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