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每改成第 元素0是每一个参数,元素1是第二个参数

http://qefqei.com/#/Arguments
元素
Arguments对象只在函数体中定义。虽然技术上说来,它不是数组,但Arguments对象有带编号的属性,这些属性可以作为数组元素,而且它有length属性,该属性声明了数组元素的个数。它的元素是作为参数传递给函数的值。元素0是每一个参数,元素1是第二个参数,以此类推。所有作为参数传递的值都会成为Arguments对象的数组元素,无论函数声明中是否有这些参数的名称。

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