放假(二)

补觉中...

1.不一样的乘法表:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>倒立的乘法表</title>
</head>
<body>
    <script type="text/javascript">
    var k = 9;
    var str = "";
    str += "<table width='600' border='1' rules='all' align='center'>";
    for(var k = 9; k>0; k--)
    {
        for(var i = k; i>0; i--)
        {
            str += "<tr>";
            for(var j = 9; j>0; j--)
            {
                str += "<td>"+j+'*'+i+'='+(j*i)+"</td>";
                if(i>1)
                {
                    i--;
                }else
                {
                    break;    
                }    
            }
        str += "</tr>";    
        }
    }
    str += "</table>";
    document.write(str);
    </script>
</body>
</html>

效果图:

2.数字图案:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>数字图形</title>
</head>
<body>
    <script type="text/javascript">
    var a = window.prompt("请输入10以内的一个数");
    for(var i=a; i>0; i--)
    {
        for(var j=i; j>0; j--)
        {
            document.write(i);
        }
        document.write("<br>");    
    }
    for(var m=2; m<=a; m++)
    {
        for(var n=1; n<=m; n++)
        {
            document.write(m);
        }
        document.write("<br>");
    }
    </script>
</body>
</html>

效果图:

3.二位数组中的平均值和最大值:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>二维数组</title>
</head>
<body>
<script type="text/javascript">
var arr = [
            [1,2,3,4],
            [5,6,7,8],
            [9,10,11,12]
] 

var a = 0;
var max = arr[0][0];
for(var i=0; i<arr.length; i++)
{
    for(var j = 0, length2 = arr[i].length; j < length2; j++){
        a += arr[i][j];
        if(max<arr[i][j]){
            max = arr[i][j];
        }
        
    }
}
document.write(a/(arr.length*length2)+"是平均值.<br>");
document.write(max+"是最大值<br>");
</script>
</body>
</html>

 

posted @ 2016-12-05 23:35  panbee  阅读(167)  评论(1)  编辑  收藏  举报