<html>
<head> <script type="text/javascript">
function getIndex()
{
//从document对象中，获取select标签
var a=document.getElementById("mySelect");
//select标签获取的值其实是一个数组--a.options[]; 然后，选定项的下标是--a.selectedIndex
var b=a.options[a.selectedIndex].value;
alert(b);
}
</script>
</head> <body>
<form name="form1" id="form1">
Select your favorite fruit:
<select id="mySelect" name="mySelect">
<option value="11">Apple</option>
<option value="22">Orange</option>
<option value="33">Pineapple</option>
<option value="44">Banana</option>
</select>
<br/><br/>
<input type="button" onclick="getIndex()" value="Alert index of selected option">
</form>
</body>
</html>
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