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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">3009</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14180" title="android内核编译方法" target="_blank" onclick="return recordId('',)">android内核编译方法 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14180" 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/14180';}else{window.open('/article/14180');}" style="cursor: pointer;">google的android很多人都希望在gphone没有出来之前，把它移植到相关的硬件平台上去。网上看了不少文章，总的感觉是：在这一步走得最远的就是openmoko的一个大师级别的黑客Ben“Benno”Leslie,他曾经试图把目前google发布的android移植到openmoko的平台上去，并且做了10000多行代码的尝试。最终虽然由于openmoko采用比较老的arm920t的内核，而android采用较新的arm926-ej-s内核，而且使用</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 22:12:47</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3009</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/625" title="jQuery选项卡tabulous" target="_blank" onclick="return recordId('',)">jQuery选项卡tabulous </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/625" 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/625';}else{window.open('/article/625');}" style="cursor: 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">3009</span></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/23249" title="形态学重建：孔洞填充的python实现" target="_blank" onclick="return recordId('',)">形态学重建：孔洞填充的python实现 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/23249" 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/23249';}else{window.open('/article/23249');}" style="cursor: pointer;">质量声明：原创文章，内容质量问题请评论吐槽。如对您产生干扰，可私信删除。主要参考：（美）拉斐尔·C.冈萨雷斯.数字图像处理第3版[M].阮秋琦,译.北京：电子工业出版社,2017:633.形态学重建形态学重建涉及两幅图像和一个结构元：Marker图像：包含变换的起点，将被连续膨胀，直至收敛Mask图像：用来约束膨胀结果，即Mask>=Marker结构单元（StructuringElement，SE）：定义连通性数学迭代式：Marker=(Marker⊕SE</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 17:45:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3008</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20017" title="ASP.NET 2.0 本地化功能：本地化 Web 应用程序" target="_blank" onclick="return recordId('',)">ASP.NET 2.0 本地化功能：本地化 Web 应用程序 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20017" 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/20017';}else{window.open('/article/20017');}" style="cursor: pointer;">适用于：MicrosoftASP.NET2.0MicrosoftVisualStudio.NETMicrosoftVisualStudio2005本地化摘要：随着越来越多的公司拓展海外业务，通过MicrosoftASP.NET创建全球化的Web应用程序显得日益重要。ASP.NET1.1通过ResourceManager类支持创建本地化的Web站点。通过改进的运行时和工具支持，ASP.NET2.0使得提供对多语言和区域的支持更加容易。下载本文的源代码。本页内</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 23:27:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3008</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/nginx/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/nginx/1/p/418">上一页</a></li> <li><a href="/search/nginx/1/p/417">417</a></li><li><a href="/search/nginx/1/p/418">418</a></li><li class="active"><span>419</span></li><li><a 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