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剩余参数和 arguments 对象的区别是什么？ #82

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LuckyWinty opened this issue Dec 6, 2020 · 2 comments

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LuckyWinty commented Dec 6, 2020

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LuckyWinty commented Dec 6, 2020

剩余参数只包含那些没有对应形参的实参（可以是参数的部分），而 arguments 对象包含了传给函数的所有实参（是参数的全部）
arguments 对象不是一个真实的数组，而剩余参数是真实的 Array 实例也就是说，能够在它上面直接使用所有的数组方法，比如 sort、map、forEach、pop
arguments 对象还有一些附加的属性(如 callee 属性)
如果想在 arguments 对象上使用数组方法，首先要将它转换为真实的数组，比如使用 [].slice.call(arguments)

SiHao24 commented Dec 7, 2020 •

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补充第四条

Array.from(arguments)
[... arguments]
Array.protoType.slice.call(arguments)

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