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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">3450</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6174" title="ON、WHERE、HAVING的区别" target="_blank" onclick="return recordId('',)">ON、WHERE、HAVING的区别 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6174" 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/6174';}else{window.open('/article/6174');}" style="cursor: pointer;">ON、WHERE、HAVING都能通过限制条件筛选数据，但他们的使用及其不同。下面我们来分析三者之间的区别。1.ON和WHERE所有的查询都回产生一个中间临时报表，查询结果就是从返回临时报表中得到。ON和WHERE后面所跟限制条件的区别，主要与限制条件起作用的时机有关，ON根据限制条件对数据库记录进行过滤，然后生产临时表；而WHERE是在临时表生产之后，根据限制条件从临时表中筛选结果。因为以上原因，ON和WHERE的区别主要有下：1）返回结果：在左外（右外</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 01:52:47</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="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">3449</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/21733" title="从零开始学习jQuery (二) 万能的选择器" target="_blank" onclick="return recordId('',)">从零开始学习jQuery (二) 万能的选择器 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21733" 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/21733';}else{window.open('/article/21733');}" style="cursor: pointer;">一.摘要本章讲解jQuery最重要的选择器部分的知识.有了jQuery的选择器我们几乎可以获取页面上任意的一个或一组对象,可以明显减轻开发人员的工作量.二.前言编写任何javascript程序我们要首先获得对象,jQuery选择器能彻底改变我们平时获取对象的方式,可以获取几乎任何语意的对象,比如"拥有title属性并且值中包含test的<a>元素",完成这些工作只需要编写一个jQuery选择器字符串.学习jQuery选择器是学习jQuery最重要的一步.三</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 23:48:33</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3448</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/13.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">3448</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/13.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">3448</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/8.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">3448</span></span>  </p> </article><article class="excerpt"> <header> <a title="IOS" class="label label-important zj-del-target" href="/category/58">IOS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12823" title="【一步一步学IOS5 】定制UITableView表视图单" target="_blank" onclick="return recordId('',)">【一步一步学IOS5 】定制UITableView表视图单 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12823" 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/12823';}else{window.open('/article/12823');}" style="cursor: pointer;">之前，我们已经创建了一个简单的表视图App，用来显示菜单列表和图片。下面，我们继续改进该App，是其效果更佳。1）实现不同的行显示不同的图片2)定制表视图单元格1.显示不同的缩略图：在修改代码之前，我们先回顾一下在数据行上显示缩略图的代码：-(UITableViewCell*)tableView:(UITableView*)tableViewcellForRowAtIndexPath:(NSIndexPath*)indexPath{staticNSStri</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 09:30:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3447</span></span>  </p> </article><article class="excerpt"> <header> <a title="Java" class="label label-important zj-del-target" href="/category/41">Java<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11520" title="Java中运行时内存结构补充" target="_blank" onclick="return recordId('',)">Java中运行时内存结构补充 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11520" 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/11520';}else{window.open('/article/11520');}" style="cursor: pointer;">Java中运行时内存结构<wbr><wbr></wbr></wbr>1.1方法区：<wbr></wbr>方法区是系统分配的一个内存逻辑区域，是JVM在装载类文件时，用于存储类型信息的(类的描述信息)。<wbr></wbr>方法区存放的信息包括：<wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr>1.1.1类的基本信息：每个类的全限定名每个类的直接超类的全限定名(可约束类型转换)</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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