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<html>
<head>
<script language="javascript">
function number(){
var obj = document.getElementById("mySelect");
// obj.options[obj.selectedIndex] = new Option("我的吃吃","4");//在當前選中的那個的值中改變
//obj.options.add(new Option("我的吃吃","4"));再添加一個option
// alert(obj.selectedIndex);//顯示序號，option自己設定的
//obj.options[obj.selectedIndex].text = "我的吃吃";更改值
// obj.remove(obj.selectedIndex);刪除功能
//遍曆
//defaultSelected
for(var i=0;i<obj.options.length;i++) {
if(obj.options[i].selected){
alert("已選擇");
}else{
alert("未選擇");
}
}
}
</script>
</head>
<body>
<select id="mySelect">
<option>我的包包</option>
<option>我的本本</option>
<option>我的油油</option>
<option selected>我的擔子</option>
</select>
<input type="button" name="button" value="查看結果" onClick="number();">
</body>
</html>
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