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以一种"廉价"的方式获取页面的标题(downmoon)

有朋友问到：“我需要得到一个webpage的title，因为这个title一般都比较靠前，只要取得html的前面少量内容就可以了。因为要取得很多个页面的title,如果下载整个htmlcode，肯定比较浪费时间。.net好像没有现成的类可以干这件事情(取得部分html)，我应该如何去实现？”一种比较"廉价"(即较小成本条件下)的解决思路：第一步：取出含有页面title部分的最小集合。这是“廉价”的关键！第二步：用正则表达式取出和</title</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 22:21:16</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3007</span></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/3518" title="jQuery ajax —— 将类AJAX方法包装起来" target="_blank" onclick="return recordId('',)">jQuery ajax —— 将类AJAX方法包装起来 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3518" 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/3518';}else{window.open('/article/3518');}" style="cursor: pointer;">上一篇文章，将jQuery.ajax中的一些细节补充完。这篇文章讲解如果将类AJAX方法都包装进jQuery.ajax中。下篇文章则讲解各预过滤器和分发器的细节。为什么要包装起来？我们知道，古老的XMLHttpRequest出于同源策略考虑，是不支持跨域的。所以，在前端想动态加载跨域Javascript脚本，通常是使用被称为ScriptDOMElement的方案，如：varscriptElem=document.createElement("script"</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 01:33:22</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3007</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/3485" title="Vimux: simple vim and tmux integration" target="_blank" onclick="return recordId('',)">Vimux: simple vim and tmux integration </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3485" 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/3485';}else{window.open('/article/3485');}" style="cursor: pointer;">Vimux:simplevimandtmuxintegrationVimux:simplevimandtmuxintegrationbyBenMillsonApr11,2012AtBraintreewetakeourtoolsseriously.Wearealwayslookingforwaystoimproveourtoolchaintomakeusmoreproductive.Becausewepair-programfull-time,wehavea</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 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pointer;">jQuery选项卡tabulous,jQuery,选项卡,tab标签切换代码,扁平设计,jQuery选项卡tabulous是一款支持Scale、Slide、ScaleUp、Flip等效果jquery插件.中国素材网.http://www.huiyi8.com/sc/484.htmljQuery选项卡tabulous</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 01:32:11</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3007</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/17443" title="ERP简介" target="_blank" onclick="return recordId('',)">ERP简介 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17443" 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/17443';}else{window.open('/article/17443');}" style="cursor: pointer;">一种ERP系统ERP是针对物资资源管理（物流）、人力资源管理（人流）、财务资源管理（财流）、信息资源管理（信息流）集成一体化的企业管理软件。一个由GartnerGroup开发的概念，描述下一代制造商业系统和制造资源计划（MRPII）软件。它将包含客户/服务架构，使用图形用户接口，应用开放系统制作。除了已有的标准功能，它还包括其它特性，如品质、过程运作管理、以及调整报告等。特别是，ERP采用的基础技术将同时给用户软件和硬件两方面的独立性从而更加容易升级。ER</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 22:53:50</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3006</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/thrift/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/thrift/1/p/417">上一页</a></li> <li><a href="/search/thrift/1/p/416">416</a></li><li><a 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