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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">3655</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/5.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">3655</span></span>  </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/20.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">3655</span></span>  </p> </article><article class="excerpt"> <header> <a title="redis" class="label label-important zj-del-target" href="/category/63">redis<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/1685" title="redis源码笔记-ae.c" target="_blank" onclick="return recordId('',)">redis源码笔记-ae.c </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1685" 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/1685';}else{window.open('/article/1685');}" style="cursor: pointer;">ae.c是redis事件框架的具体实现，这篇blog对这份源码进行简单说明。其中谈到了作者已经标记的一些未来可能做的改进。ae.c1#include<stdio.h>2#include<sys/time.h>3#include<sys/types.h>4#include<unistd.h>5#include<stdlib.h>67#include"ae.h"8#include"zmalloc.h"9#include"config.h"1011/*Inclu</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 01:32:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3655</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/18145" title="使用工具安装，运行，停止，卸载Window服务" target="_blank" onclick="return recordId('',)">使用工具安装，运行，停止，卸载Window服务 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18145" 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/18145';}else{window.open('/article/18145');}" style="cursor: pointer;">WSWinForm.exe介绍WSWinForm.exe是我自己开发的一个实用的小工具，用于将任何EXE程序作为Windows服务运行。也就是说WSWinForm只是其注册程序的服务外壳，这个特性对于我们来说非常实用，我们可以通过它来安装，运行，停止，卸载Windows服务，而不再是通过命令行InstallUtil的方式来安装。资源下载你可以通过本文下载。应用程序源代码如何使用下载完软件以后，我们能干些什么呢？看看这个截图吧：。这里可以看到的操作：1.安装</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 23:02:36</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3654</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/12182" title="使用FFMPEG SDK解码流数据获得YUV数据及其大小" target="_blank" onclick="return recordId('',)">使用FFMPEG SDK解码流数据获得YUV数据及其大小 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12182" 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/12182';}else{window.open('/article/12182');}" style="cursor: pointer;">本文以H264视频流为例，讲解解码流数据的步骤。为突出重点，本文只专注于讨论解码视频流数据，不涉及其它（如开发环境的配置等）。如果您需要这方面的信息，请和我联系。准备变量定义AVCodecContext。如果您使用类，可以定义成类成员。我这里定义成全局变量。staticAVCodecContext*g_pCodecCtx=NULL;定义一个AVFrame，AVFrame描述一个多媒体帧。解码后的数据将被放在其中。staticAVFrame*g_pavfFr</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 09:30:12</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3654</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/mysql/1/p/1">首页</a></li> <li class="prev-page"><a 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