编写一个带有两个变量和一个运算符的函数，调用时接收prompt输入
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<html xmlns="http:///1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>编写一个带有两个变量和一个运算符的函数，调用时接收prompt输入</title>
<script language="javascript" type="text/javascript">
function account()
{
var op1=prompt("请输入第一个数：","");
var op2=prompt("请输入第二个数：","");
var sign=prompt("请输入运算符号","")
var result;
opp1=parseFloat(op1);
opp2=parseFloat(op2);
switch(sign)
{
case "+":
result=opp1+opp2;
break;
case "-":
result=opp1-opp2;
break;
case "*":
result=opp1*opp2;
break;
default:
result=opp1/opp2;
}
alert("两数运算结果为："+op1+sign+op2+"="+result);
}
</script>
</head>
<body>
<input name="btn" type="button" value="计算两数运算结果" οnclick="account();" />
</body>
</html>
