它通过检查网页的结构和布局提取数据
Scrapers, which extract data by examining the structure and layout of a Web page
另一个检查网页是否已经被拦截的地方就是在网页源代码本身。
Another place to check if a page has been blocked is within the page's HTML source code itself.
本节描述如何检查网页上的错误并建立全域错误处理常式。
This section describes how to check for errors in your pages and create global error handlers.
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