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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">3672</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/15538" title="君正4750开发板使用日记6-uCOS(minios)的开发配" target="_blank" onclick="return recordId('',)">君正4750开发板使用日记6-uCOS(minios)的开发配 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15538" 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/15538';}else{window.open('/article/15538');}" style="cursor: pointer;">大半年没有搞君正的开发板了，最近总算有机会再试试JZ4750的uc/osII配置。也在此做个记录，供参阅。ucos要在linux环境下编译，我仍是在windows下用VMWareUbuntuServer910虚拟机，用Putty连接登录后执行命令。我一开始并没有拿到了JZ4750的ucos的SDK（随机光盘上只有一个可烧录的DEMO），于是从君正官网的FTP里下载了Jz-uCOS-Development-guide.pdf、mipsel-4.1.2-nop</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 22:29:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3672</span></span>  </p> </article><article class="excerpt"> <header> <a title="PHP" class="label label-important zj-del-target" href="/category/64">PHP<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14673" title="IIS7.X配置PHP运行环境" target="_blank" onclick="return recordId('',)">IIS7.X配置PHP运行环境 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14673" 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/14673';}else{window.open('/article/14673');}" style="cursor: pointer;">摘要：很久没有接触过php的东西了，今天有个程序需要一个php的运行环境。由于只需要简单的跑一下程序，因此觉得没有必要弄一个LAMP的环境（如果需要配LAMP环境的话可以参考我写的关于PHP的blog），不如直接用IIS来运行吧。主要内容：使用IIS运行PHP程序一、使用IIS运行PHP程序1.首先下载PHP，这里我下载的是php5.2.14（如果是其他高版本的话可能找不到php5isapi.dll，其相关配置方法暂且不论），建议下载zip压缩包，不需安装</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 22:18:44</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3672</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/9861" title="vb操作word" target="_blank" onclick="return recordId('',)">vb操作word </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9861" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/9861';}else{window.open('/article/9861');}" style="cursor: pointer;">vb操作word[追加500分求教]VB操作WORD问题悬赏分：200-解决时间：2007-7-2811:42说明，用VB操作WORD,以下源码第一次操作完全正常，正常打开，正常替换，正常退出。进程中并没有留下windword的进程，但第二次继续操作时就出问题，运行到ReplaceWord()就出现462错误，关闭程序重新开始又正常。请指教出错及解决原因，追加到500分'=============打开word==============FunctionOp</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 09:27:07</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3672</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/20294" title="浅析C++中虚函数的调用及对象的内部布局" target="_blank" onclick="return recordId('',)">浅析C++中虚函数的调用及对象的内部布局 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20294" 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/20294';}else{window.open('/article/20294');}" style="cursor: pointer;">在我那篇《浅析C++中的this指针》中，我通过分析C++代码编译后生成的汇编代码来分析this指针的实现方法。这次我依然用分析C++代码编译后生成的汇编代码来说明C++中虚函数调用的实现方法，顺便也说明一下C++中的对象内部布局。下面所有的汇编代码都是用VC2005编译出来的。虽然，不同的编译器可能会编译出不同的结果，对象的内部布局也不尽相同；但是，只要是符合C++标准的编译器，编译结果和对象的内部布局应该是大同小异。首先，是一个有着简单继承关系的两个类</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 23:30:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3671</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/18108" title="WebBrowser 控件概述" target="_blank" onclick="return recordId('',)">WebBrowser 控件概述 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18108" 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/18108';}else{window.open('/article/18108');}" style="cursor: pointer;">出处:http://msdn2.microsoft.com/zh-cn/library/w290k23d(VS.80).aspx全部折叠<styletype="text/css">.vb,.cs,.cpp,.nu{display:none;}</style><styleid="LanguageSpecificTextStyle"type="text/css">.nu{display:inline;}</style>ThispageisspecifictoM</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 23:02:08</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3671</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/3.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">3671</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/11358" title="股票API之---新浪财经频道" target="_blank" onclick="return recordId('',)">股票API之---新浪财经频道 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11358" 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/11358';}else{window.open('/article/11358');}" style="cursor: pointer;">实时股票数据接口大全股票数据的获取目前有如下两种方法可以获取:1.http/javascript接口取数据2.web-service接口1.http/javascript接口取数据1.1Sina股票数据接口以大秦铁路（股票代码：601006）为例，如果要获取它的最新行情，只需访问新浪的股票数据接口：http://hq.sinajs.cn/list=sh601006这个url会返回一串文本，例如：varhq_str_sh601006="大秦铁路,27.55,</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 09:29:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3671</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/linux/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/linux/1/p/185">上一页</a></li> 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