一、步骤
1.获得文本框的值
var text = document.getElementById(
"op").
value;
2.创建选项对象
var op =
new Option(
text);
3.添加选项
show.options[show.options.length] = op;
二、代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
var add = function(){
var show = document.getElementById("show")
var op = new Option(document.getElementById("op").value);
show.options[show.options.length] = op;
}
var del = function(){
var show = document.getElementById("show")
if(show.options.length>0){
show.remove(show.options.length-1);
}
}
</script>
</head>
<body>
<input id = "op" type="text" />
<input type="button" value="增加" onclick="add()"/>
<input type="button" value="删除" onclick="del()"/><br/>
<select id="show" size="8" style="width: 120px;"></select>
</body>
</html>
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