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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">3462</span></span>  </p> </article><article class="excerpt"> <header> <a title="Windows" class="label label-important zj-del-target" href="/category/52">Windows<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/16296" title="windows下彻底删除MySQL" target="_blank" onclick="return recordId('',)">windows下彻底删除MySQL </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16296" 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/16296';}else{window.open('/article/16296');}" style="cursor: pointer;">卸载mysql其实也是一门艺术1)控制面板里卸载2)如果你的操作系统用户名是Administrator则删除C:\DocumentsandSettings\Administrator\ApplicationData\MySQL3)删除C:\DocumentsandSettings\AllUsers\ApplicationData\MySQL4)删除注册表regedit搜索mysqlwindows下彻底删除MySQL</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 22:39:25</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3462</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/20529" title="一致性Hash算法(KetamaHash)的c#实现" target="_blank" onclick="return recordId('',)">一致性Hash算法(KetamaHash)的c#实现 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20529" 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/20529';}else{window.open('/article/20529');}" style="cursor: pointer;">最近在研究"一致性HASH算法"（ConsistentHashing），用于解决memcached集群中当服务器出现增减变动时对散列值的影响。后来在JAVAEYE上的一篇文章中，找到了其中的KetamaHash算法的JAVA实现（一种基于虚拟结点的HASH算法），于是为了加深理解，对照JAVA版本，用C#重写了一个。放到这里，如果大家感兴趣的话，可以下载测试一下，如果发现写法有问题请及时告之我，以便我及时修正。下面是对Ketama的介绍：Ketamaisa</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 23:33:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3461</span></span>  </p> </article><article class="excerpt"> <header> <a title="MySql" class="label label-important zj-del-target" href="/category/47">MySql<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/5215" title="MySQL 备份" target="_blank" onclick="return recordId('',)">MySQL 备份 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/5215" 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/5215';}else{window.open('/article/5215');}" style="cursor: pointer;">http://rimuhosting.com/howto/mysqlbackup.jspAutomatedMySQLDatabaseBackupVersion1WanttobackupyourMySQLdatabasestoanothermachineonanightlybasis?Thencreatea/etc/cron.daily/mysqlbackup.shjoblikethis:mysqldump--compress-uroot-p$pw-h$cu</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 01:51:41</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3461</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/682" title="无法解决 equal to 操作中 "SQL_Latin1_General" target="_blank" onclick="return recordId('',)">无法解决 equal to 操作中 "SQL_Latin1_General </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/682" 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/682';}else{window.open('/article/682');}" style="cursor: pointer;">无法解决equalto操作中"SQL_Latin1_General_CP1_CI_AS"和"Chinese_PRC_CI_AS"之间的排序规则冲突。CannotresolvethecollationconflictbetweenSQL_Latin1_General_CP1_CI_ASandFinnish_Swedish_CI_ASintheequaltooperation.工作中，从国外得到一个MSSQLServer2005的备份文件，打算把他还原到本地服</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 01:32:12</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3461</span></span>  </p> </article><article class="excerpt"> <header> <a title="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/148" title="安装insight" target="_blank" onclick="return recordId('',)">安装insight </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/148" 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/148';}else{window.open('/article/148');}" style="cursor: pointer;">甚是蛋疼参考：1首先从这里下载源码(这东西可是有20+MB,慢慢下载喔)下面详细说一下操作方法：1解压insight-6-8-1sudotarjvxfinsight-6-8-1.tar.bz22修改源代码，然后进入insight-6-8-1/gdbcdinsight-6-8-1/gdbsudogediti386-linux-nat.c在头文件部分加上：#include"i387-tdep.h"保存，退出3.从新回到insight目录,生成Makefilec</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 01:31:43</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3461</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20459" title="ASP.NET服务器控件开发（3）--事件和回传数据的" target="_blank" onclick="return recordId('',)">ASP.NET服务器控件开发（3）--事件和回传数据的 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20459" 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/20459';}else{window.open('/article/20459');}" style="cursor: pointer;">前两篇介绍了服务器控件的基本显示，属性的设定，继承Webcontrol开发控件等内容，这篇介绍下定制服务器控件的事件的处理和回传数据的处理。当ASP.NET页面处理回传到服务器端的表单时，两种信息会传递给页面中的控件：回传事件，如Button一类控件触发的回传，会引发服务器端事件；回传数据：是Web表单中包含的数据，该数据是在Web表单提交到服务器端时传递给如TextBox一类的控件。处理回传数据PostBack（回传）：ASP.NET控件提交表单到服务器</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 23:32:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3460</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14933" title="【Android 开发教程】保存到外部存储设备（SD卡" target="_blank" onclick="return recordId('',)">【Android 开发教程】保存到外部存储设备（SD卡 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14933" 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/14933';}else{window.open('/article/14933');}" style="cursor: pointer;">本章节翻译自《Beginning-Android-4-Application-Development》，如有翻译不当的地方，敬请指出。原书购买地址http://www.amazon.com/Beginning-Android-4-Application-Development/dp/1118199545/上一节介绍了如何把文件存储到内部设备。有的时候，需要把文件存储到外部存储设备，比如SD卡。因为SD卡具有更大的存储空间，同时也可以很容易的和其他用户分享这</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 22:22:02</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3460</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/5111" title="[预告] [3月8日] 《Redis 设计与实现》" target="_blank" onclick="return recordId('',)">[预告] [3月8日] 《Redis 设计与实现》 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/5111" 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/5111';}else{window.open('/article/5111');}" style="cursor: pointer;">[预告][3月8日]《Redis设计与实现》[预告][3月8日]《Redis设计与实现》2013-02-2810:36:27自从开始在博客断断续续地写一些Redis的源码分析文章以来，我一直有这样一个打算：不是间隔地、分多次地写多篇Redis的源码分析文章，而是抽出一段时间，对Redis的源码做一次完整的分析，并将其中的关键点、以及有趣的部分记录下来，集结成一个文档（或者更通俗地说，一本书？）。我在2012年12月开始将“Redis源码书”的这个想法付诸实</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 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