用js实现1-100组成的随机数组

<script type="text/javascript">
        function GetRandomNum(Min, Max) {
            var Range = Max - Min;
            var Rand = Math.random();
            return (Min + Math.round(Rand * Range));
        }

        Array.prototype.in_array = function (e) {
            for (var i = 0; i < this.length; i++) {
                if (this[i] == e) {
                    return true;
                }
            }
            return false;
        }

        var intArr = [];
        while (intArr.length < 100) {
            var num = GetRandomNum(1, 100);
            if (!intArr.in_array(num)) {
                intArr[intArr.length] = num;
            }
        }

        alert(intArr.length);
        for (var i = 0; i < intArr.length; i++) {
            document.write(i + "......" + intArr[i] + "<br />");
        }

    </script>