<html><head><script type="text/javascript">function alertIndex() { var x=document.getElementById("mySelect").selectedIndex; var y=document.getElementsByTagName("option"); alert(y[x].text + " has the index of: " + y[x].index); //要想取得下拉框中选中的值，实际就是取得option标签下的某个索引的值 }</script></head><body>
<form>请选择您喜欢的水果：<select id="mySelect"> <option>苹果</option> <option>桃子</option> <option>香蕉</option> <option>桔子</option></select><br /><br /><input type="button" οnclick="alertIndex()" value="显示被选水果的 index"></form>
</body></html>
