<script> <br> function js(){ <br> var n = document.getElementById("form1").value; <br> for (i=1,sum=0;i<=n;i++) <br> { <br> for(j=1,cj=1;j<=i;j++) <br> {cj=cj*j;} <br> sum=sum+cj; <br> } <br> document.getElementById("form2").value=sum <br> } <br> </script>
计算∑N！ | |
输入整数N的值： | |
∑N！= | |
回复讨论(解决方案)
<html ><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>项目3</title></head><style type="text/css">.div{background-color:#339966;width:700px;height:250px;margin:0 auto;border:20px groove #4CBE4C;}.STYLE1 {color: #FFFFFF;font-weight: bold;font-size: 24px;}</style><body><script type="text/javascript"> function js(){ var n = parseInt(document.getElementById("N").value)||0; var r=1; for (i=1;i<=n;i++){r*=i;} document.getElementById("sum").value=r }</script><div class="div"> <form id="form3" name="form3" method="post" action=""> <table width="700" border="0" align="center"> <tr> <td height="50" colspan="2"><p align="center" class="STYLE1" >计算∑N！</p></td> </tr> <tr> <td height="50" class="STYLE1"><div align="center">输入整数N的值：</div></td> <td height="50"> <label> <input type="text" name="N" id="N" /> </label> </td> </tr> <tr> <td height="50" class="STYLE1"><div align="center">∑N！=</div></td> <td height="50"> <label> <input type="text" name="sum" id="sum" /> </label> </td> </tr> <tr> <td height="50"> <label> <div align="center"> <input type="submit" name="Submit" value="计算∑N！" onClick="js();return false;"/> </div> </label></td> <td height="50"> <label> <div align="center"> <input type="reset" name="Submit2" value="清空" /> </div> </label> </td> </tr> </table> </form> </div></body></html>
