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<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
    </head>
    <body>
        <div id="qiuhe">
            请输入金额：<input type="text" name="price" id="price" value="" /><br />
            请输入数量：<input type="text" name="num" id="num" value="" />
            <button type="button" id="tijiao">提交</button>
        </div>
        <script type="text/javascript">
            var tijiao = document.getElementById("tijiao");
            tijiao.onclick = function(){
                var price = document.getElementById("price").value;
                var num = document.getElementById("num").value;
                console.log(price);
                var sum1 = price*num;
                window.alert("你要求的乘积是：" + sum1);    
            }
        </script>
    </body>
</html>