凌晨遇到一个控制台报错的信息，总是显示有对象中的元素未定义
明明是有把定义对象的值的，后面发现是把没有返回值的函数又赋值一遍给未定义的元素所属的对象，😓 😳
此函数没有返回值：
原因，是因为将没有返回值的函数赋值给元素未定义的对象了
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