JS 利用set去重，再转数组

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    let arr = [1,2,3,4,2,3];

    let s = new Set(arr);
    console.log(s); // Set(4) {1, 2, 3, 4}

    var s1 = Array.from(s);
    console.log(s1); //  [1, 2, 3, 4]