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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">3440</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 class="zj-icon-text">2019-08-12 01:51:33</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3440</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/21328" title="ASP.NET MVC模型绑定的6个建议" target="_blank" onclick="return recordId('',)">ASP.NET MVC模型绑定的6个建议 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21328" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/21328';}else{window.open('/article/21328');}" style="cursor: pointer;">ASP.NETMVC中的ModelBinding使用起来非常简单。你的Action方法需要数据，在传入的HTTP请求中携带着你需要的数据，数据可以在请求的表单数据中，还可能在你的URL地址本身中。通过DefaultModelBinder，可以神奇地将表单中的数据和路由中的数据转换到对象中。ModelBinder使得你的控制器代码可以干净地从请求以及关联的环境中分离出来。这里有一些关于在MVC项目中更好使用ModelBinding的建议。Tip#1:最好使用</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 23:43:33</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3439</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/19.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">3439</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/6731" title="Redis 查询" target="_blank" onclick="return recordId('',)">Redis 查询 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6731" 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/6731';}else{window.open('/article/6731');}" style="cursor: pointer;">字符串类型是Redis中最为基础的数据存储类型，它在Redis中是二进制安全的，这便意味着该类型可以接受任何格式的数据，如JPEG图像数据或Json对象描述信息等。在Redis中字符串类型的Value最多可以容纳的数据长度是512M。1.SET/GET/APPEND/STRLEN:/>redis-cli#执行Redis客户端工具。redis127.0.0.1:6379>existsmykey#判断该键是否存在，存在返回1，否则返回0。(integer)0r</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 01:53:25</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3439</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/3.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">3438</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/1687" title="InnoSetup使用笔记" target="_blank" onclick="return recordId('',)">InnoSetup使用笔记 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1687" 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/1687';}else{window.open('/article/1687');}" style="cursor: pointer;">今天用InnoSetup做安装包时，因为要装的驱动区分32位、64位，64位系统中要安装32位+64位驱动。想在脚本中进行判断。折腾一阵，终于搞定：参考了：http://379910987.blog.163.com/blog/static/3352379720111164242382/InnoSetup使用笔记</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">3438</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/6187" title="PHP 之Mysql增删改查操作案例" target="_blank" onclick="return recordId('',)">PHP 之Mysql增删改查操作案例 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6187" 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/6187';}else{window.open('/article/6187');}" style="cursor: pointer;">1：user表：CREATETABLE`user`(`id`int(11)NOTNULLAUTO_INCREMENT,`name`varchar(32)NOTNULL,PRIMARYKEY(`id`))ENGINE=MyISAMDEFAULTCHARSET=utf82：mysqltools.php(mysql工具类)<?phpclassMySqlTools{private$host='127.0.0.1';private$uname='root';priv</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">3437</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/email/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/email/1/p/188">上一页</a></li> <li><a href="/search/email/1/p/187">187</a></li><li><a href="/search/email/1/p/188">188</a></li><li class="active"><span>189</span></li><li><a href="/search/email/1/p/190">190</a></li><li><a href="/search/email/1/p/191">191</a></li> <li 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