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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">3413</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/711" title="IOS开发--第三阶段--微博（4）（程序1）" target="_blank" onclick="return recordId('',)">IOS开发--第三阶段--微博（4）（程序1） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/711" 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/711';}else{window.open('/article/711');}" style="cursor: pointer;">入口类方法中，用来布局主框架，如下图所示：创建一个ViewController，在入口类中导入头文件，并创建其视图，并在入口类中再创建四个视图；创建UITabBarController，将所创建的视图放入TabBarController的viewControllers中；IOS开发--第三阶段--微博（4）（程序1）</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">3413</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/21600" title="基于Asp.net、SVG技术的WebGIS研究与实现" target="_blank" onclick="return recordId('',)">基于Asp.net、SVG技术的WebGIS研究与实现 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21600" 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/21600';}else{window.open('/article/21600');}" style="cursor: pointer;">摘要本文在分析了用SVG表示地理空间信息的特点后，将SVG应用到WebGIS中，系统研究的主要内容是使用Asp.net、SVG技术，结合SQLServer后台数据库技术动态的生成SVG图形；利用脚本语言Javascrīpt和DOM技术，很好的实现了地图的缩放、平移和还原、图层的控制等WebGIS客户端功能。关键词Asp.net;SVG;Javascrīpt;DOM;WebGIS1引言WebGIS是Internet与GIS的结合产物，也是GIS研究的一个重要</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 23:46:55</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3412</span></span>  </p> </article><article class="excerpt"> <header> <a title="CSS" class="label label-important zj-del-target" href="/category/68">CSS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/17585" title="详解css中用clip剪切图片的原理和方法" target="_blank" onclick="return recordId('',)">详解css中用clip剪切图片的原理和方法 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17585" 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/17585';}else{window.open('/article/17585');}" style="cursor: pointer;">clip剪切图片示意图假设原图片的宽度高度500×375（px）<html><head><styletype="text/css"></style></head><body><imgsrc="http://photo7.yupoo.com/20070428/081241_1280937036.jpg"width="500"height=</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 22:55:34</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3412</span></span>  </p> </article><article class="excerpt"> <header> <a title="Hadoop" class="label label-important zj-del-target" href="/category/60">Hadoop<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11775" title="Hadoop 的 TotalOrderPartitioner" target="_blank" onclick="return recordId('',)">Hadoop 的 TotalOrderPartitioner </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11775" 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/11775';}else{window.open('/article/11775');}" style="cursor: pointer;">http://blog.oddfoo.net/2011/04/17/mapreduce-partition%E5%88%86%E6%9E%90-2/Partition所处的位置Partition位置Partition主要作用就是将map的结果发送到相应的reduce。这就对partition有两个要求：1）均衡负载，尽量的将工作均匀的分配给不同的reduce。2）效率，分配速度一定要快。Mapreduce提供的PartitionerMapreduce默认的</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 09:29:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3412</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/15822" title="javaScript 对象大全（javascript code al 2）" target="_blank" onclick="return recordId('',)">javaScript 对象大全（javascript code al 2） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15822" 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/15822';}else{window.open('/article/15822');}" style="cursor: pointer;">javaScript对象大全JavaScript是网景（Netscape）公司开发的一种基于客户端浏览器、面向（基于）对象、事件驱动式的网页脚本语言。JavaScript语言的前身叫作Livescript。JavaScript的特点：简单、易学、易用；跨平台；IE、Navigator符合ECMA（欧洲计算机制造协会）标准，可移植；事件驱动式的脚本程序设计思想；动态、交互式的操作方式。JavaScript的作用：交互式操作；表单验证；网页特效；Web游戏服务</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 22:33:25</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3411</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/11630" title="SWT窗口禁用最大化" target="_blank" onclick="return recordId('',)">SWT窗口禁用最大化 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11630" 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/11630';}else{window.open('/article/11630');}" style="cursor: pointer;">SWT中的窗口窗口样式Shellshell=newShell(newDisplay(),SWT.MIN);Shell类的不同样式SWT.TITLE:只显示标题栏SWT.CLOSE:只显示关闭SWT.MIN:只显示最小化和关闭SWT.MAX:只显示最大化和关闭SWT.BORDER:只显示边框SWT.RESIZE:窗口的大小可以通过鼠标手动来设定SWT.NO_TRIM:既无边框也无标题SWT.SHELL_TRIM:相当于CLOSETITLEMINMAXRESI</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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