The use of digital sort sort

Sort, sortable string, sorted by ASCII code.

However, a comparison function may be through, to achieve more contents of the array, the array sorting function.

 var arr = [40, 32, 45, 89, 93, 0, 46, 74];
        var arr1 = arr.sort(function (a, b) {
            return a - b;
        });
        console.log('升序：' + arr1);

        var arr2 = arr.sort(function (a, b) {
            return b - a;
        });
        console.log('降序：' + arr2);

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