JS 判断 Select 下拉框的值

var obj = document.getElementById('TcElement_BDB_WinbidInstance'); //selectid

var index = obj.selectedIndex; // 选中索引

//var text = obj.options[index].text; // 选中文本

var value = obj.options[index].value; // 选中值

   alert(value);

    }

    </script>

</head>
<body>
    <form onchange='aa()' ><OPTION Value=''>          </OPTION>
<Option Value='中标'>中标</Option>
<Option Value='未中标'>未中标</Option>
<Option Value='弃标'>弃标</Option>
</select>

每天进步一点点。。。

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