<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<script>
function 创建Select() {
var _select = document.createElement("select");
_select.id = "mySelect";
document.body.appendChild(_select);
}
function addOption() {
//根据id查找对象，
var _select = document.getElementById('mySelect');
//添加一个选项
_select.add(new Option("文本", "值")); //这个只能在IE中有效
//这个兼容IE与firefox
_select.options.add(new Option("北京", "BK"));
_select.options.add(new Option("上海", "SH"));
_select.options.add(new Option("武汉", "大武汉"));
}
function getOption(){
var _select=document.getElementById('mySelect');
//序号，取当前选中选项的序号
var index=_select.selectedIndex;
var val = _select.options[index].text;
alert(val)
}
function 修改Option(){
var _select=document.getElementById('mySelect');
var index=_select.selectedIndex;
var val = _select.options[index]=new Option("新文本","新值");
}
</script>
<body>
<input type="button" value="创建Select" onclick="创建Select()" />
<br>
<input type="button" value="添加选项" onclick="addOption()" />
<br>
<input type="button" value="getOption" onclick="getOption()" />
<br>
<input type="button" value="修改" onclick="修改Option()" />
<br>
</body>
</html>
