Es6的set用法
链接：https://www.nowcoder.com/questionTerminal/fbe541dfca37499a9713c1bcc862bc40?toCommentId=7804070
来源：牛客网
哪位大神指点迷津一下呀😓
来源：牛客网
Array.prototype.noRepeat = () => {
return [...new Set(this)];
}
//这里有个奇怪的问题
let arr = [1,2,3,4,5,4,3]
let a1 = arr.noRepeat() // a1 [1, 2, 3, 4, 5]
let arr2 = ['a','b','c','d','b','a']
let b = arr2.noRepeat() // b [1, 2, 3, 4, 5],这里为什么会报错呢？？？
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