地址重写，分三个阶段。为了防止黑客通过地址攻击，开了这个控件，有效的隐藏了真是的地址，还可以对地址以及参数进行加密-Address rewrite, in three stages. In order to prevent hackers from through address attack, opened this control, effective hidden really address, still can encrypt and parameters to address!!