JavaScript由单价、数量计算总价

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>无标题文档</title>

<script type="text/javascript">

var result,result1,result2;

function aa1()

    {

        document.getElementById("result1").innerHTML = "";

        var x1 = document.getElementById("num1").value;

        var reg = new RegExp(/^\d*$/);

        if(!reg.test(x1))

        {

            document.getElementById("result1").innerHTML = "数量非法！";

            document.getElementById("num1").focus();

            //document.getElementById("num1").select();

            return;

        }

        var x2 = document.getElementById("price1").value;

        var reg = new RegExp(/^\d*[\.]?\d*$/);

        if(!reg.test(x2))

        {

            document.getElementById("result1").innerHTML = "单价非法！";

            document.getElementById("price1").focus();

            return;

        }

        document.getElementById("result1").innerHTML = x1*x2;

        result1=x1*x2;

    }  

function aa2()

    {

        document.getElementById("result2").innerHTML = "";

        var x1 = document.getElementById("num2").value;

        var reg = new RegExp(/^\d*$/);

        if(!reg.test(x1))

        {

            document.getElementById("result2").innerHTML = "数量非法！";

            document.getElementById("num2").focus();

            //document.getElementById("num2").select();

            return;

        }

        var x2 = document.getElementById("price2").value;

        var reg = new RegExp(/^\d*[\.]?\d*$/);

        if(!reg.test(x2))

        {

            document.getElementById("result2").innerHTML = "单价非法！";

            document.getElementById("price2").focus();

            return;

        }

        document.getElementById("result2").innerHTML = x1*x2;

        result2=x1*x2;

        //document.getElementById("result").innerHTML =result1+result2;

        result=result1+result2;

    document.getElementById("result").innerHTML =result;

    }  

</script>

</head> 

<body>

品名       单价                数量                金额小计<br>

苹果    <input type="text" name="price1" id="price1" onblur="aa1()" />

<input type="text" name="num1" id="num1" onblur="aa1()" />

        

<label id="result1"></label>

<br>

香蕉    <input type="text" name="price2" id="price2" onblur="aa2()" />

<input type="text" name="num2" id="num2" onblur="aa2()" />

        

<label id="result2"></label>

<br>

金额总计<label id="result" ></label>

</body>

</html>
本文出自 “阿凡达” 博客，请务必保留此出处http://shamrock.blog.51cto.com/2079212/819698
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JavaScript由单价、数量计算总价

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