输出一组数字中的最小数

    function sortNumber(a,b){
        return a - b
    }
    function min() {
        var arr = []
        for (var i=0; i<arguments.length; i++){
            arr[i] = arguments[i]
        }
        document.write(arr.sort(sortNumber)[0])
     }
     min(2, 4, 1, -1, 56, 3, -7)

    function min() {
        var minNumber=arguments[0];
        for (var i=1; i<arguments.length; i++){
            if (minNumber >= arguments[i]){
                minNumber = arguments[i]
            }
        }
        document.write(minNumber)
    }
    min.apply(window,[2, 4, 1, -1, 56, 3, -7])