这看起来很简单，但可能出现问题，这取决于文档的组织。
This seems simple enough, but there can be problems, depending upon the organization of your document.
阅读了三篇关于使用文档对象类型的文章之后，再来讨论它是不是很简单了？
That's a bit of a letdown after three articles on using the Document Object Model, isn't it?
删除文档很简单。
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