摘要：Simply by being in the language, the withstatement significantly slows down JavaScript processors because it frustrates the lexical binding of variable names. It was well intentioned, but the language would be better if it didn't have it. 阅读全文

摘要：假如header中有多个title出现,则最后显示的是第一个title标签的内容这在覆盖模板的时候有用处 阅读全文