<script type="text/javascript">

       var i = 100;

       var newi,num,num0,num1,num2;

       // var x;

       // x=window.getTime;

       t= new Date();

          x = t.getTime();

       // console.log(x);

       while (i <= 999)

        {

          i++;

          // console.log(i);

          newi=i.toString().split("");//分割3位数

          num0=Number(newi[0]);

          num1=Number(newi[1]);

          num2=Number(newi[2]);

          num=(num0*num0*num0)+(num1*num1*num1)+(num2*num2*num2);//每个数的立方相加

          if (num==i)//判断

          {

              document.write(i+"<br />");

          }

       }

       t= new Date();

       y = t.getTime();

       // console.log(y);

       document.write("耗时："+(y-x));

    </script>

        <script type="text/javascript">

        var i = 100;

        var n1,n2,n3,num;

        t= new Date();

        x = t.getTime();

        while (i<=999)

          {

              // console.log(i);

              n1 = (i-i%100)/100;//百位数字

            n2 = (i%100-i%10)/10;//十位数字

            n3 = i%10;//个位数字

            num=n1*n1*n1+n2*n2*n2+n3*n3*n3;

            if (i==num)

            {

                document.write(i+"<br>")

             };

             ++i;

          };

          t= new Date();

          y = t.getTime();

          // console.log(y);

          document.write("耗时："+(y-x));

        </script>

<script type="text/javascript">

    document.write("<table  rules=all align=center cellpadding=5 border=1 >");

        for (var i = 1; i<=9; i++) {

            document.write("<tr>");    //行

            for (var n = 1; n <= i; n++) {

                document.write("<td>"+n+"x"+i+"="+n*i+"</td>");//列

            }

            document.write("</tr>");//行

        }

    document.write("</table>");

    </script>

<script type="text/javascript">

        var arr=[2,5,4,10,15,20,1]

        var n;//遍历值

        var big=arr[0];//取索引0

        var small=arr[0];//取索引0

        var x;//下标

        var y;//下标

        document.write(arr+"<br />");

        for (var i = 0; i < arr.length; i++) {

            n=arr[i+1]//从索引1开始比

            if (n>big) {

                big=n//置最大数

                x=i+1//记录最大下标

            }

            if (n<small) {

                small=n//置最小数

                y=i+1//记录最小下标

            }

        }

        document.write("最大："+big+"下标："+x+"<br />");

        document.write("最小："+small+"下标："+y);

    </script>