我在找算法/图书馆(最好是在 c# 中), 可以明智地检测到 html 页面内容的变化 。
例如,如果网页是echcrunch.com, 只有当网页出现新文章或重大变化时, 页面才会匹配。 它会忽略 html 的评论、 javascript、 微小更新, 如评论数量等...
有人能指我方向对吗?
您可以使用 JavaScript 来计算页面上的元素数量, 或者页面的具体部分 。 有数千种方法可以执行 JS 来检测变化 。
我假设,你要求你的C#程序页面。
事实上,有数百种方法可以做到这一点。
我给你一个:
第一,最简单最假的算法...
while(true) {
checkModifyDate();
if(date is newer) {
do anything you want...
}
do it again in next 10 mins()
}
That checkModifyDate() function will "ONLY" check the HTTP Header for changes.
Then you can do anything later.
您可以将它添加到每xxx分钟运行一次的定时器对象或线索中, 并设置它来自动为您执行该任务 。
希望这能帮上忙
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