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

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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.

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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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