<script language="javascript">
function CheckProduct(){
var id = document.getElementById("testId").value;
if(id != ""){
location.href='option.html?id='+id;
}
}
</script>
</head>
<body>
<span id="orderId" style="border:#F00">
<select id="testId" name="testName" onchange="return CheckProduct();">
<option value="1" > 1 </option>
<option value="2" > 2 </option>
<option value="3" > 3 </option>
<option value="4" > 4 </option>
</select> </p>
</span>
</body>
var obj = document.getElementById("testId");
var id = obj.options[obj.selectedIndex].value;
………
//var id = document.getElementById("testId").value;
var obj = document.getElementById("testId");
var id = obj.options[obj.selectedIndex].value;
location.href='option.html?id='+id;
}zerda : 加后还是不行?