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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">3291</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/17165" title="iOS中编码转化" target="_blank" onclick="return recordId('',)">iOS中编码转化 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17165" 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/17165';}else{window.open('/article/17165');}" style="cursor: pointer;">iOS中编码转化1.UTF-8转化NSString*data=@"你好，北京！";//转换成UTF-8NSString*dataUTF8=[datastringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];NSLog(@"%@",dataUTF8);//UTF-8转GBK,将UTF8代码替换，官方解释如下。//Replacesallpercentescapeswiththematchin</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 22:50:23</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3291</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/11068" title="(IBM)最大限度利用 JavaScript 和 Ajax 性能" target="_blank" onclick="return recordId('',)">(IBM)最大限度利用 JavaScript 和 Ajax 性能 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11068" 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/11068';}else{window.open('/article/11068');}" style="cursor: pointer;">简介在web早期，优化web页面的性能通常意味着避免了使用不必要的HTML标记，将JavaScript代码量控制到最小，并尽量减小所有图片文件大小，否则上网冲浪者会走开去泡杯咖啡来等待页面加载。web各个方面的改进也意味着我们现在面临新的性能考虑。尽管DSL和宽带为很多人提供了对Internet上更多内容的高速访问，我们对加载时间和响应的期望也在发展，希望在页面上执行操作后能立刻得到结果。AsynchronousJavaScriptandXML(Ajax)</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 09:29:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3291</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/10721" title="《openstack 和hadoop的区别是什么？》" target="_blank" onclick="return recordId('',)">《openstack 和hadoop的区别是什么？》 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10721" 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/10721';}else{window.open('/article/10721');}" style="cursor: pointer;">openstack和hadoop的区别是什么？（一）openstack仿照的Amazon的云，hadoop仿照的是Google的云openstack注重的是虚拟化/虚拟机及其配套的服务，hadoop注重的是海量的数据分析和处理。（二）2OpenStack主要目的是做一整套的云计算基础构架。包括云计算(Compute),网络(Network)，对象存贮(ObjectStore)，镜像文件存储(Image)，身份认证(Authentication)，Block</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 09:27:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3291</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/4126" title="Javascript图像处理——图像金字塔" target="_blank" onclick="return recordId('',)">Javascript图像处理——图像金字塔 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/4126" 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/4126';}else{window.open('/article/4126');}" style="cursor: pointer;">前言上一篇文章，我们讲解了边缘梯度计算函数，这篇文章我们来了解图像金字塔。图像金字塔？图像金字塔被广泛用于计算机视觉应用中。图像金字塔是一个图像集合，集合中所有的图像都源于同一个原始图像，而且是通过对原始图像连续降采样获得的。——《学习OpenCV》常见的图像金字塔有下面两种：高斯金字塔(Gaussianpyramid):用来向下采样拉普拉斯金字塔(Laplacianpyramid):用来从金字塔低层图像重建上层未采样图像高斯金字塔类似金字塔一样，高斯金字</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 01:33:37</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3291</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/19735" title="C++学习笔记(五)--虚函数表解析" target="_blank" onclick="return recordId('',)">C++学习笔记(五)--虚函数表解析 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19735" 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/19735';}else{window.open('/article/19735');}" style="cursor: pointer;">前言C++中的虚函数的作用主要是实现了多态的机制。关于多态，简而言之就是用父类型别的指针指向其子类的实例，然后通过父类的指针调用实际子类的成员函数。这种技术可以让父类的指针有“多种形态”，这是一种泛型技术。所谓泛型技术，说白了就是试图使用不变的代码来实现可变的算法。比如：模板技术，RTTI技术，虚函数技术，要么是试图做到在编译时决议，要么试图做到运行时决议。关于虚函数的使用方法，我在这里不做过多的阐述。大家可以看看相关的C++的书籍。在这篇文章中，我只想从</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 23:23:28</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3289</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/18145" title="使用工具安装，运行，停止，卸载Window服务" target="_blank" onclick="return recordId('',)">使用工具安装，运行，停止，卸载Window服务 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18145" 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/18145';}else{window.open('/article/18145');}" style="cursor: pointer;">WSWinForm.exe介绍WSWinForm.exe是我自己开发的一个实用的小工具，用于将任何EXE程序作为Windows服务运行。也就是说WSWinForm只是其注册程序的服务外壳，这个特性对于我们来说非常实用，我们可以通过它来安装，运行，停止，卸载Windows服务，而不再是通过命令行InstallUtil的方式来安装。资源下载你可以通过本文下载。应用程序源代码如何使用下载完软件以后，我们能干些什么呢？看看这个截图吧：。这里可以看到的操作：1.安装</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 23:02:36</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3289</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/mobile/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/mobile/1/p/192">上一页</a></li> <li><a href="/search/mobile/1/p/191">191</a></li><li><a href="/search/mobile/1/p/192">192</a></li><li class="active"><span>193</span></li><li><a href="/search/mobile/1/p/194">194</a></li><li><a href="/search/mobile/1/p/195">195</a></li> <li class="next-page"><a 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