下拉列表的触发事件
<html>
<head>
<script type="text/javascript">
function forwardTo(){
var x=document.getElementById("se");
if(x.selectedIndex==1){
location.href="b.html"
}
}
</script>
</head>
<body>
<select id="se" onchange="forwardTo()" >
<option value="1">dede</option>
<option value="2">qqqq</option>
</select>
</body>
</html>