Javascript中数组的sort()和reverse()方法

<script type="text/javascript">
        //
        
        /*
        需求：
        Num1,Num2,Num3,Num4,在程序运行中，这四个数会发生改变，找出最大的那个数字对应的变量。假设
        Num1=10,Num2=3,Num3=80,Num4=34;
        输出的结果应该是:NumD
        */
        var Num1=40, Num2=20, Num3=90, Num4=5;
        arrayLength=4;
        var numArray=new Array();
        for (var i = 0; i < arrayLength; i++) {
            numArray.push(Num1);
            numArray.push(Num2);
            numArray.push(Num3);
            numArray.push(Num4);
        }


        //复制数组
        var tempArray=new Array();
        for (var i = 0; i < 4; i++) {
            tempArray[i]=numArray[i];
        }
        var sortedNum = tempArray.sort().reverse();
        var maxNum = sortedNum[0];

        var myindex;
        for (var j = 0; j < arrayLength; j++) {
            if (numArray[j] == maxNum) {
                myindex = parseInt(j)+1;
                break;
            }
        }
        document.write("The max number in the Array:Num" + myindex + "<br/>");
        

    </script>

在Javascript中进行数组复制，使用for循环的方法，性能消耗很大。可以使用slice()或contact()方法。

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