es6 filter（）去重

let arr = [1, 2, 3, 2, 3, 5, 6, 4, 2, 45, 23, 3, 2, 4, 8] let arr2 = arr.filter((x, index, self) => { return self.indexOf(x) === index }) console.log(arr2) 效果：javascript  還能夠簡化一下：html let arr

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