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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">3289</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/20.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">3289</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/21061" title="Registering JavaScript object methods as cal" target="_blank" onclick="return recordId('',)">Registering JavaScript object methods as cal </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21061" 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/21061';}else{window.open('/article/21061');}" style="cursor: pointer;">RegisteringJavaScriptobjectmethodsascallbacksNovember27,2007Tags:ajaxTheregistrationofcallbackfunctionsisverycommoninJavaScriptwebprogramming,forexampletoattachuserinterfaceeventhandlers(suchasonclick),ortoprovideafunctiontohandle</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 23:40:15</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3288</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/17902" title="常用的js验证数字，电话号码，传真，邮箱，手机" target="_blank" onclick="return recordId('',)">常用的js验证数字，电话号码，传真，邮箱，手机 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17902" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/17902';}else{window.open('/article/17902');}" style="cursor: pointer;">1、数字CodefunctiontestisNum(object){vars=document.getElementById(object.id).value;if(s!=""){if(isNaN(s)){alert(</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 22:59:29</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3288</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/7.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">3288</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/14.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">3288</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/10577" title="【thrift】vc中使用thrift中文字符串乱码问题解" target="_blank" onclick="return recordId('',)">【thrift】vc中使用thrift中文字符串乱码问题解 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10577" 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/10577';}else{window.open('/article/10577');}" style="cursor: pointer;">问题描述：VC中使用Apachethrift时，如果字符串中包含中文，会出现乱码问题，这个问题的原因是由于thrift为了达到跨语言交互而使用了UTF-8格式发送字符串，这点对java或者C#不会造成影响，但是在VC中UTF-8却很成问题。VC中的string编码随项目编码一般是multibytes或者unicode，虽然倡导使用unicode，但实际上使用multibytes多字节开发仍然广泛存在，下面的解决方案主要解决的是多字节下的乱码问题。解决方案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 09:27:31</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3287</span></span>  </p> </article><article class="excerpt"> <header> <a title="Ubuntu" class="label label-important zj-del-target" href="/category/55">Ubuntu<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/1618" title="Ubuntu下deb包的安装方法" target="_blank" onclick="return recordId('',)">Ubuntu下deb包的安装方法 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1618" 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/1618';}else{window.open('/article/1618');}" style="cursor: pointer;">deb是debianlinus的安装格式，跟redhat的rpm很类似，最主要的安装命令是：dpkg-ifile.debdpkg是DebianPackage的简写，是为Debian专门开发的套件管理系统，方便软件的安装、更新及移除。全部源自Debian的Linux发行版都使用dpkg，比如Ubuntu、Knoppix等。下面是一些Dpkg的普通使用方法：1、dpkg-i<package.deb>安装一个Debian软件包，如你手动下载的文件。2、dpkg-</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 01:32:34</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3287</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/18.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">3286</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/win8/1/p/1">首页</a></li> <li class="prev-page"><a 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