网页计算器-蒲公英云

网页计算器

<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html"; charset="gb2312">
<title>网页计算器</title>
    <script language="javascript">
        document.write("<h1 align=center><font color=red>网页计算器</font></h1>");
        function account(ys)
        {
            var x=document.calculate.num1.value;
            var y=document.calculate.num1.value;
            var s=document.calculate.num1.value;
            if(x!=""&&y!="")
            {
                if(isNaN(x)==true||isNaN(y)==true)
                {
                    alert("请输入数字")
                    return;
                }
                switch(ys)
                {
                    case'+'    :
                        var res=parseFloat(x)+parseFloat(y);
                        document.calculate.result.value=res;
                        break;
                    case'-':
                        var res=parseFloat(x)-parseFloat(y);
                        document.calculate.result.value=res;
                        break;
                    case'*':
                        var res=parseFloat(x)*parseFloat(y);
                        document.calculate.result.value=res;
                        break;
                    case'/':
                        if(parseFloat(y)==0)
                            {
                                alert("除数为0，结果为无穷大");
                                return;
                            }
                        else
                            {
                                var res=parseFloat(x)/parseFloat(y);
                                document.calculate.result.value=res;
                            }
                        break;
                    default:
                        alert("运算符输入不正确，请重新输入");
                        return;
                }
            }
        }
    </script>
</head>
    <body>    
        <form name="calculate">
            <p align="center">操作数1<input type="text" name="num1" border="0"></p>
            <p align="center">操作数2<input type="text" name="num2" border="0"></p>
            <p align="center">计算结果<input type="text" name="result" border="0"></p>
            <p align="center">
            <input type="hidden" name="sign">
            <input type="button" name="add" value="+" onClick="account('+')">
            <input type="button" name="sub" value="-" onClick="account('-')">
            <input type="button" name="mul" value="*" onClick="account('*')">
            <input type="button" name="div" value="/" onClick="account('/')">
            </p>
        </form>
    </body>
<body>
</body>
</html>