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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">3650</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/4.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">3650</span></span>  </p> </article><article class="excerpt"> <header> <a title="C#" class="label label-important zj-del-target" href="/category/43">C#<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6725" title="在.NET平台下使用C#通过Thrift访问Cassandra" target="_blank" onclick="return recordId('',)">在.NET平台下使用C#通过Thrift访问Cassandra </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6725" 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/6725';}else{window.open('/article/6725');}" style="cursor: pointer;">几家做seo无耻公司名单http://www.byywee.comhttp://www.cosdiv.com通过在自已网站加入别人网站连接，这种网站专门对新开通的网站做连接,从而达到宣传他们目的，http://www.renrenaj.com/about/copyright.html1、下载Thrift两个文件:thrift-0.7.0.tar.gzThriftcompilerforWindows2、获取Thrift.dll解压后，找到源代码：thrift</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 01:53:24</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3650</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/2013" title="CodeSmith学习笔记(二)：操作数据库" target="_blank" onclick="return recordId('',)">CodeSmith学习笔记(二)：操作数据库 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2013" 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/2013';}else{window.open('/article/2013');}" style="cursor: pointer;">1.打开SchemaExploer配置数据库连接，定义表属性的Type为SchemaExplorer.TableSchema,数据库属性Type为SchemaExplorer.DatabaseSchema.2.定义内部的方法，下面调用用到的3.循环表的非主键4.定义输出到文件，枚举类型（头部定义属性时用到），常量。5.选择属性6.运行，结果如下CodeSmith学习笔记(二)：操作数据库</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 01:32:44</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3650</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/11.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">3650</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/6.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">3649</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/3.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">3649</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/column/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/column/1/p/185">上一页</a></li> <li><a href="/search/column/1/p/184">184</a></li><li><a href="/search/column/1/p/185">185</a></li><li class="active"><span>186</span></li><li><a href="/search/column/1/p/187">187</a></li><li><a href="/search/column/1/p/188">188</a></li> <li class="next-page"><a 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