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parent支持需要类方法能够获取到自己的名字,这个名字是存储在类方法自己身上的。
如果出现将某一函数设置给不同名字的类成员,则会throw Error,以避免调用parent错误,但这样有可能影响现有的代码,建议改成warning输出,不知是否可以直接使用console.warning输出此信息?