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各位老师，这种写法什么意思，“？”代表的什么？
破案：提交到本页面的意思，类似于“#”，可以理解为刷新当前页面，但是可以在方法中根据条件实际控制，比如：method是否为POST等。 不知道对不对，先这么理解，求正解！
