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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">3307</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/9789" title="svn判断通过svnkit，获取最新的revision以及判" target="_blank" onclick="return recordId('',)">svn判断通过svnkit，获取最新的revision以及判 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9789" 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/9789';}else{window.open('/article/9789');}" style="cursor: pointer;">新手发帖，很多方面都是刚入门，有错误的地方请大家见谅，欢迎批评指正在java下，已经有一个非常壮大的工具，svnkit，为我们封装了非常全面的svn操作类。但是，笔者在应用时，就碰到两个问题，还是略微琢磨了一阵子，才想到解决办法（我应用的是1.x版本的svnkit，不清楚2.x版本的，是否有更直接的方法）问题1：如何获得指定svn路径的最新revsion问题2：判断某svn路径下，某个revsion号是否存在讲这两个问题前，首先要理清Repository及</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 09:27:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3307</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/737" title="vim——vim配置步骤" target="_blank" onclick="return recordId('',)">vim——vim配置步骤 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/737" 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/737';}else{window.open('/article/737');}" style="cursor: pointer;">1.直接到githubhttps://github.com/lucasysfeng/k-vim依照README.md步骤配置。2.注意gitclone的地址为https://github.com/lucasysfeng/k-vim.git配置步骤clone到本地,配置到linux个人目录（如果是从linux_config过来的，不需要clone）gitclonehttps://github.com/lucasysfeng/k-vim.git安装依赖包#ub</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 01:32:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3307</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/20763" title="Mongodb Redis HBase" target="_blank" onclick="return recordId('',)">Mongodb Redis HBase </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20763" 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/20763';}else{window.open('/article/20763');}" style="cursor: pointer;">from:soclassictobenotedhere.Inthislight,hereisacomparisonofCassandra,Mongodb,CouchDB,Redis,Riak,Membase,Neo4jandHBase:CouchDB(V1.1.1)Writtenin:ErlangMainpoint:DBconsistency,easeofuseLicense:ApacheProtocol:HTTP/RESTBi-directional(!</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 23:36:32</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3306</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/15211" title="利用BeanUtils在对象间复制属性" target="_blank" onclick="return recordId('',)">利用BeanUtils在对象间复制属性 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15211" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/20.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15211';}else{window.open('/article/15211');}" style="cursor: pointer;">commons-beanutils是jakartacommons子项目中的一个软件包，其主要目的是利用反射机制对JavaBean的属性进行处理。我们知道，一个JavaBean通常包含了大量的属性，很多情况下，对JavaBean的处理导致大量get/set代码堆积，增加了代码长度和阅读代码的难度（你的薪水按代码行数计算？那千万别让老板看到此帖哦）BeanUtils是这个包里比较常用的一个工具类，这里只介绍它的copyProperties()方法。该方法定义如</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 22:25:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3306</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/10.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">3306</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/9805" title="C#操作Word完全功略！" target="_blank" onclick="return recordId('',)">C#操作Word完全功略！ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9805" 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/9805';}else{window.open('/article/9805');}" style="cursor: pointer;">【摘自】http://tmsoft.lsxy.com/trackback.php?tbID=334&extra=2aa67d周老师科研站前提：导入COM库：Microsoftword11.0ObjectLibrary.引用里面就增加了：创建新WordobjectoMissing=System.Reflection.Missing.Value;Word._ApplicationoWord;Word._DocumentoDoc;oWord=newWord.Ap</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 09:27:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3306</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/linux/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/linux/1/p/191">上一页</a></li> <li><a href="/search/linux/1/p/190">190</a></li><li><a href="/search/linux/1/p/191">191</a></li><li class="active"><span>192</span></li><li><a href="/search/linux/1/p/193">193</a></li><li><a href="/search/linux/1/p/194">194</a></li> <li class="next-page"><a 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