3.25 

<body>
<input type="text" id="abc" />
<input type="button" value="阶乘求和结果" onclick="a()" />
</body>
</html>
<script>
function a()
{          
            var n=document.getElementById("abc");            
            var n1=n.value;            
            var c=isNaN(n1);
            if(c==false)
            {
            
            var sum=0;           
            for (var i = 1; i <= n1; i++)
            {
                var sum1 = 1;
                for (var j = 1; j <= i; j++)
                {
                    sum1 *= j;
                }
                sum += sum1;
            }
            document.writeln(sum);
            }
            else
            {
                alert("你的输入有误！");}
                }

function b()
{
 var sum = 0;
            for (var i = 1; i <= 100; i++)
            {
               
        if(i % 7 == 0 || i % 10 == 7||i/10>=7&&i/10<8)
                   {
                       document.writeln(i);
                       sum+=i;
                   }                  
            }
            document.writeln(sum);
}
            b();
</script>

 

posted @ 2016-03-29 08:20  一枚小兵  阅读(173)  评论(0)    收藏  举报