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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">3412</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">3412</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/19.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">3412</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/8.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">3411</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/19.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">3411</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/13.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="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/2.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">3411</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/148" title="安装insight" target="_blank" onclick="return recordId('',)">安装insight </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/148" 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/148';}else{window.open('/article/148');}" style="cursor: pointer;">甚是蛋疼参考：1首先从这里下载源码(这东西可是有20+MB,慢慢下载喔)下面详细说一下操作方法：1解压insight-6-8-1sudotarjvxfinsight-6-8-1.tar.bz22修改源代码，然后进入insight-6-8-1/gdbcdinsight-6-8-1/gdbsudogediti386-linux-nat.c在头文件部分加上：#include"i387-tdep.h"保存，退出3.从新回到insight目录,生成Makefilec</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 01:31:43</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/20.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 fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:52</span></span> <span class="muted"><i class="fa 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