javascript - 将数字舍入到最接近的 3 的倍数

Question

我如何将数字四舍五入到最接近 3 的倍数？

即

25 would return 27
1 would return 3
0 would return 3
6 would return 6

Answer 1

    if(n > 0)
        return Math.ceil(n/3.0) * 3;
    else if( n < 0)
        return Math.floor(n/3.0) * 3;
    else
        return 3;