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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">3218</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/5.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">3218</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/21553" title="how to install jdk on ubuntu" target="_blank" onclick="return recordId('',)">how to install jdk on ubuntu </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21553" 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/21553';}else{window.open('/article/21553');}" style="cursor: pointer;">apt-getinstallsun-java6-jdksun-java6-jre有点习惯于用命令行安装的方式了，省得去网上找页面下载，还要找迅雷下什么的，配上好的源挺省事的不过配置环境变量还是熟悉，费了些功夫，PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"LANG="zh_CN.UTF-8"LANGUAGE="zh_CN:zh:en_US:en"C</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 23:46:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3217</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/21061" title="Registering JavaScript object methods as cal" target="_blank" onclick="return recordId('',)">Registering JavaScript object methods as cal </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21061" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/21061';}else{window.open('/article/21061');}" style="cursor: pointer;">RegisteringJavaScriptobjectmethodsascallbacksNovember27,2007Tags:ajaxTheregistrationofcallbackfunctionsisverycommoninJavaScriptwebprogramming,forexampletoattachuserinterfaceeventhandlers(suchasonclick),ortoprovideafunctiontohandle</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 23:40:15</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3217</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/5.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">3217</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/8511" title="mysql支持IOS的Emoji表情" target="_blank" onclick="return recordId('',)">mysql支持IOS的Emoji表情 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8511" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8511';}else{window.open('/article/8511');}" style="cursor: pointer;">原因：UTF-8编码有可能是两个、三个、四个字节。Emoji表情是4个字节，而Mysql的utf8编码最多3个字节，所以数据插不进去。解决办法：将Mysql的编码从utf8转换成utf8mb4步骤：1.修改mysql配置文件my.inidefault-character-set=utf8mb4character-set-server=utf8mb42.加入[client]port=3306default-character-set=utf8mb4[mysq</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 01:55:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3217</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/21785" title="40种网页常用小技巧(javascript)" target="_blank" onclick="return recordId('',)">40种网页常用小技巧(javascript) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21785" 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/21785';}else{window.open('/article/21785');}" style="cursor: pointer;">1.oncontextmenu=window.event.returnValue=false将彻底屏蔽鼠标右键<tableborderoncontextmenu=return(false)><td>no</table>可用于Table2.<bodyonselectstart=returnfalse>取消选取、防止复制3.onpaste=returnfalse不准粘贴4.oncopy=returnfalse;oncut=returnfalse;防止复制5.<</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 23:49:11</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3216</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/15211" title="利用BeanUtils在对象间复制属性" target="_blank" onclick="return recordId('',)">利用BeanUtils在对象间复制属性 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15211" 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/15211';}else{window.open('/article/15211');}" style="cursor: pointer;">commons-beanutils是jakartacommons子项目中的一个软件包，其主要目的是利用反射机制对JavaBean的属性进行处理。我们知道，一个JavaBean通常包含了大量的属性，很多情况下，对JavaBean的处理导致大量get/set代码堆积，增加了代码长度和阅读代码的难度（你的薪水按代码行数计算？那千万别让老板看到此帖哦）BeanUtils是这个包里比较常用的一个工具类，这里只介绍它的copyProperties()方法。该方法定义如</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 22:25:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3216</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/11068" title="(IBM)最大限度利用 JavaScript 和 Ajax 性能" target="_blank" onclick="return recordId('',)">(IBM)最大限度利用 JavaScript 和 Ajax 性能 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11068" 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/11068';}else{window.open('/article/11068');}" style="cursor: pointer;">简介在web早期，优化web页面的性能通常意味着避免了使用不必要的HTML标记，将JavaScript代码量控制到最小，并尽量减小所有图片文件大小，否则上网冲浪者会走开去泡杯咖啡来等待页面加载。web各个方面的改进也意味着我们现在面临新的性能考虑。尽管DSL和宽带为很多人提供了对Internet上更多内容的高速访问，我们对加载时间和响应的期望也在发展，希望在页面上执行操作后能立刻得到结果。AsynchronousJavaScriptandXML(Ajax)</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 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