如何在javascript中将页面的完整内容作为字符串获取？

I'm writing a bookmarklet, i.e. a bookmark that contains javascript instead of a URL, and I have some trouble. In fact, I cannot remember how I can get the content of the page as a string, so I can apply a regular expression to find what I want. Can you please help me on this?I'm writing a bookmarklet, i.e. a bookmark that