获取下拉列表框的个数和索引
<script type="text/javascript">
function get()
{
var index=document.getElementById("fruit").selectedIndex; var len=document.getElementById("fruit").length; var show=document.getElementById("show"); show.innerHTML="被选选项的索引号为："+index+"<br/>下拉列表选项数目为："+len;
}
</script>
</head>
<body> <form action="" method="post" name="myform"> <select id="fruit" onchange="get()"> <option value="apple">苹果</option> <option value="orange">桔子</option> <option value="bananer">香蕉</option> <option value="pineapple">菠萝</option> <option value="peach">桃</option> </select><div id="show"></div> </form> </body>
