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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">3668</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/14.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">3668</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/13.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">3668</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/15894" title="Python与C之间的相互调用（Python C API及Pytho" target="_blank" onclick="return recordId('',)">Python与C之间的相互调用（Python C API及Pytho </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15894" 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/15894';}else{window.open('/article/15894');}" style="cursor: pointer;">writeby九天雁翎(JTianLing)--blog.csdn.net/vagrxie讨论新闻组及文件我实现“onekeycodehighlighter"中碰到的一些小问题，需要实现全局快捷键，但是是事实上Qt并没有对全局快捷键提供支持，那么用Qt的话就只能通过Win32Api来完成了，而我，用的是PyQt，还需要用Python来调用win32API，事实上，都没有什么难的。因为Python如此的流行，导致，开源社区按照自己的爱好，对于Python与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 22:34:19</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3667</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/7.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">3667</span></span>  </p> </article><article class="excerpt"> <header> <a title="操作系统" class="label label-important zj-del-target" href="/category/34">操作系统<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/2998" title="iptables学习" target="_blank" onclick="return recordId('',)">iptables学习 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2998" 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/2998';}else{window.open('/article/2998');}" style="cursor: pointer;">droidwall.sh#!/system/bin/shIPTABLES=iptablesBUSYBOX=busyboxGREP=grepECHO=echo#Trytofindbusyboxif/data/data/com.example.my_android_wall/app_bin/busybox_g1--help>/dev/null2>/dev/null;thenBUSYBOX=/data/data/com.example.my_android_wa</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 01:33:09</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3667</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/3.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">3667</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/13.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">3666</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/19800" title="UML" target="_blank" onclick="return recordId('',)">UML </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19800" 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/19800';}else{window.open('/article/19800');}" style="cursor: pointer;">爱因斯坦曾说过，我们生活在四维空间（xyz在加一条时间t，就是四维了）内。也就是说我们所看到的事物是一个个立体状的模型。抽象地说我们的生活是由一幅幅图组成的，每一时刻对应着一幅图。形象的说我们的眼睛所看到的是生活中的一个个场景，一个个场景组成了一幅图，一幅幅图成为了世界的投影。这些场景是如何组成的呢？其实很简单，场景是由事物和关系组成，如：人、手机、书、电脑等，把这些事物连接到一起记录下来不就组成图了吗。在生活中我们常常用相机或摄影机将图记录下来，这就是我</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 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