qq_41287158的博客

数组去重let arr = [1,2,3,4,3,2,1]const unique = [ ...new Set(arr) ] // [1,2,3,4]并集let arr1 = new Set([1,2,3])let arr2 = new Set([2,3,4])const union = [...new Set([...arr1,...arr2])] // [1,2,3,4]交集let arr1 = new Set([1,2,3])let arr2 = new Set([2,3,