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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">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/2.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="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/14209" title="程序员应该知道的 13 个设计技巧" target="_blank" onclick="return recordId('',)">程序员应该知道的 13 个设计技巧 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14209" 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/14209';}else{window.open('/article/14209');}" style="cursor: pointer;">开发你的美感…我最喜欢的站点是：awwwards.com–多看每日和每月上榜站点unmatchedstyle.com–评论很有用dribbble.com（Easy注：我经常去，很多NB的app设计都在上边patterntap.com多花些时间我在开发应用和网站时，会在设计上花掉和编码同样的时间。好的设计需要时间来完善。在开始项目时，我一般对于整体布局有基本的想法。当我有想法的时候，我同时进行设计和编程。我会在开发细节功能的同时在浏览器里边设计那些细节。这可</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 22:13:10</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="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/12.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">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/18.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">3305</span></span>  </p> </article><article class="excerpt"> <header> <a title="C++" class="label label-important zj-del-target" href="/category/42">C++<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12122" title="从C/C++语言到Objective-C语言" target="_blank" onclick="return recordId('',)">从C/C++语言到Objective-C语言 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12122" 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/12122';}else{window.open('/article/12122');}" style="cursor: pointer;">无标题文档原文链接:http://www.yifeiyang.net/iphone-development-introduction-7-from-the-c-c-language-to-objective-c-language/Objective-C，通常写作ObjC和较少用的ObjectiveC或Obj-C，是扩充C的面向对象编程语言。所以有一定C/C++语言基础理解和掌握Objective-C也会相应的快些。这回，我们将比较着学习Objective-</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 09:30:10</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3305</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/6362" title="nodejs中使用monk訪问mongodb" target="_blank" onclick="return recordId('',)">nodejs中使用monk訪问mongodb </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6362" 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/6362';}else{window.open('/article/6362');}" style="cursor: pointer;">mongodb安装mongodb我认为还是用mannualinstall靠谱一点儿：http://docs.mongodb.org/manual/tutorial/install-mongodb-on-os-x/启动mongodb$mongod连接mogodb$mongomongo>usemonk-appmongo>db.products.insert({"name":"applejuice","description":"good"})WriteResu</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 01:53:02</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3305</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/18924" title="jquery实现的视差滚动教程(视差大背景效果)" target="_blank" onclick="return recordId('',)">jquery实现的视差滚动教程(视差大背景效果) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18924" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/18924';}else{window.open('/article/18924');}" style="cursor: pointer;">视差滚动（ParallaxScrolling）是指让多层背景以不同的速度移动，形成立体的运动效果，带来非常出色的视觉体验。作为今年网页设计的热点趋势，越来越多的网站应用了这项技术。现在越来越多的网站采用视差水平滚动来创建绚丽的效果，其实这样的效果使用jquery实现的，上一次我发布了一篇使用这个效果做的网站，《40个视差滚动效果网站的新技术应用》，今天就给大家分享一下这样的效果实现原理，下一次在做网站的时候你就可以使用这样的效果作出绚丽的效果Demo1–创</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 23:12:47</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3304</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/column/1/p/1">首页</a></li> <li class="prev-page"><a 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