数组去重、数组合并去重排序

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数组去重

    let a = [1,2,3,4,4,5,6];
    let b = [...new Set(a)];  // [1,2,3,4,5,6];

数组合并、去重

    let arr1 = [1, 25, 2, 26, 1234, 6, 213];
    let arr2 = [2, 6, 2134, 6, 31, 623];
    let c = […new Set([…arr1, …arr2])].sort((a, b) => {
        return a - b;
    });