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C++

C++学习笔记(五)--虚函数表解析

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

系统 2019-08-29 23:23:28 3000

Javascript

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">3000</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></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/11.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">3000</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></span>--> </p> </article><article class="excerpt"> <header> <a title="C#" class="label label-important zj-del-target" href="/category/43">C#<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/9805" title="C#操作Word完全功略!" target="_blank" onclick="return recordId('',)">C#操作Word完全功略! </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9805" 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/9805';}else{window.open('/article/9805');}" style="cursor: pointer;">【摘自】http://tmsoft.lsxy.com/trackback.php?tbID=334&extra=2aa67d周老师科研站前提:导入COM库:Microsoftword11.0ObjectLibrary.引用里面就增加了:创建新WordobjectoMissing=System.Reflection.Missing.Value;Word._ApplicationoWord;Word._DocumentoDoc;oWord=newWord.Ap</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 09:27:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3000</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></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/16957" title="使用纯javascript通过className来获取元素 (ge" target="_blank" onclick="return recordId('',)">使用纯javascript通过className来获取元素 (ge </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16957" 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/16957';}else{window.open('/article/16957');}" style="cursor: pointer;">MarkFinklesuggestedthatIdosomespeedtesting,nowthatanativeimplementationofgetElementsByClassNamehaslandedintheMozillatrunk(destinedforFirefox3).SoIwentaroundanddugupallofthedifferent,existing,implementationsthatIcouldfind.Currently</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 22:47:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2999</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></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/15531" title="iOS App的图标,启动画面及其它" target="_blank" onclick="return recordId('',)">iOS App的图标,启动画面及其它 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15531" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15531';}else{window.open('/article/15531');}" style="cursor: pointer;">注意:最新的图标尺寸和文件名规格以Apple的文档为准:TechnicalQ&AQA1686:AppIconsoniPadandiPhone。其中要注意,iTunesArtWork这项不用写入Info.plist的Iconfiles。这点Apple的文档加粗说明了。图标的圆角和光晕效果圆角效果。图标的圆角效果是系统自动加上的,我们不能控制。这也是为什么我们看到的每个图标,其圆角效果是完全相同的。光晕效果。光晕效果也是系统加上的,和“圆角”不同的是,光晕效果</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 22:29:50</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2999</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></span>--> </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8284" title="sqlldr日期格式" target="_blank" onclick="return recordId('',)">sqlldr日期格式 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8284" 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/8284';}else{window.open('/article/8284');}" style="cursor: pointer;">日期格式终止等OPTIONS(direct=true,ERRORS=50,skip=0,rows=10000,readsize=20971520,bindsize=20971520)Loaddatainfile'input.txt'"str'****@@@@'"truncateintotableaction_cfieldsterminatedby'@#$'optionallyenclosedby'%%%%%'(ACTION_ID,TimeDATE'YYYY</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 01:55:00</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2999</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></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/4580" title="JavaScript 语言基础知识点总结(思维导图)" target="_blank" onclick="return recordId('',)">JavaScript 语言基础知识点总结(思维导图) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/4580" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/4580';}else{window.open('/article/4580');}" style="cursor: pointer;">JavaScript数组JavaScript函数基础Javascript运算符JavaScript流程控制JavaScript正则表达式JavaScript字符串函数JavaScript数据类型JavaScript变量Window对象DOM基本操作JavaScript语言基础知识点总结(思维导图)</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 01:33:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2999</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></span>--> </p> </article><article class="excerpt"> <header> <a title="Jquery" class="label label-important zj-del-target" href="/category/65">Jquery<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3833" title="jQuery ajax —— Baidu ajax" target="_blank" onclick="return recordId('',)">jQuery ajax —— Baidu ajax </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3833" 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/3833';}else{window.open('/article/3833');}" style="cursor: pointer;">你没有看错标题,本文的确是在讲Baiduajax,不过是很久很久以前的版本了。由于jQueryajax模块有800+行,而核心函数jQuery.ajax就有380+行,直接分析这段代码很容易被代码逻辑弄晕。所以我们先分析一段简单的ajax代码,来自早期的百度七巧板项目。通过这个来先复习一遍ajax的知识。baidu.ajax.request分离版/***发送一个ajax请求*@author:allstar,erik,berg*@nameajax.reque</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 01:33:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2999</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></span>--> </p> </article><article class="excerpt"> <header> <a title="Python" class="label label-important zj-del-target" href="/category/44">Python<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/25118" title=""开火车的纸牌游戏"-python版本" target="_blank" onclick="return recordId('',)">"开火车的纸牌游戏"-python版本 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/25118" 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/25118';}else{window.open('/article/25118');}" style="cursor: pointer;">小Byte和小Dance玩一种叫“开火车的”纸牌游戏,游戏规则如下:1.初始给两人随机平分52张扑克牌,每个人26张;2.小Byte先开始,将第一张牌放下;3.随后两人轮流按序(按从第一张到最后一张的顺序出牌,手中牌的顺序不可以被打乱)放置扑克,后一张扑克压在前一张扑克上;4.如果出现之前放下的某张扑克s和将要放下的扑克t点数相同,则当前玩家获得从s到t之间所有的牌(包括s和t这两张);5.玩家手上26张牌都出完后,清点双方获得的牌数,牌数多的玩家获胜,若</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">2019-09-27 17:48:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2998</span></span> <!-- <span class="muted"><i class="fa fa-comments-o"></i> <a target="_blank" href="https://cuiqingcai.com/7080.html#respond">0评论</a></span> <span class="muted"> <a href="javascript:;" class="action zj-addlike"><i class="fa fa-heart-o"></i><span class="count">16</span>喜欢</a></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/193">上一页</a></li> <li><a href="/search/linux/1/p/192">192</a></li><li><a href="/search/linux/1/p/193">193</a></li><li class="active"><span>194</span></li><li><a href="/search/linux/1/p/195">195</a></li><li><a href="/search/linux/1/p/196">196</a></li> <li class="next-page"><a href="/search/linux/1/p/195">下一页</a></li> 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