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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">3455</span></span>  </p> </article><article class="excerpt"> <header> <a title="Jquery" class="label label-important zj-del-target" href="/category/65">Jquery<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/15528" title="jQuery : ddSlick 自定义select下拉框 custom d" target="_blank" onclick="return recordId('',)">jQuery : ddSlick 自定义select下拉框 custom d </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15528" 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/15528';}else{window.open('/article/15528');}" style="cursor: pointer;">ddSlick是一个轻量级的jQuery插件用来实现定制的下拉组件。主要特点：Addsimagesanddescriptiontootherwiseboringdropdowns.UsesJSONtopopulatethedropdownoptions.UsesMinimumcssandnoexternalstylesheetstodownload.Supportscallbackfunctionsonselection.Worksasgoodevenwi</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 22:29:47</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3455</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/14.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">3453</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/7.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">3453</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/747" title="《BI项目笔记》SSAS部署时发生的问题——元数据" target="_blank" onclick="return recordId('',)">《BI项目笔记》SSAS部署时发生的问题——元数据 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/747" 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/747';}else{window.open('/article/747');}" style="cursor: pointer;">原文:《BI项目笔记》SSAS部署时发生的问题——元数据管理器中存在错误解决办法在生成和部署期间出错。是否继续？解决办法：用MicrosoftSQLServerManagementStudio连接AnalysisServices然后删除多维数据库，重新布署。这样就OK的。《BI项目笔记》SSAS部署时发生的问题——元数据管理器中存在错误解决办法</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 01:32:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3452</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/4.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">3451</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/30347" title="python 将列表中的字符串转为数字" target="_blank" onclick="return recordId('',)">python 将列表中的字符串转为数字 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30347" 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/30347';}else{window.open('/article/30347');}" style="cursor: pointer;">python将列表中的字符串转为数字转自：https://www.jb51.net/article/86561.htm本文实例讲述了Python中列表元素转为数字的方法。分享给大家供大家参考，具体如下：有一个数字字符的列表：1numbers=['1','5','10','8']想要把每个元素转换为数字：1numbers=[1,5,10,8]用一个循环来解决：1234new_numbers=[];forninnumbers:new_numbers.appen</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">2019-09-27 17:56:24</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3450</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/18.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">3450</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/2.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 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