<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>选择框应用</title>
<Script>
function createOptions(){
sel1 = document.form1.select1;
sel2 = document.form1.select2;
var num = sel1.selectedIndex; //获取选中项的编号
var option = new Option(sel1.options[num].text);//建立option
var item = sel2.options.length;
sel2.options[item] = option; //加入option到选择框中
}
</Script>
<form name="form1">
<select name="select1" size="10">
<option>可选择项目
<option>---------------
<option value="banana">香蕉
<option value="grape">葡萄
<option value="apple">苹果
<option value="pear">梨子
</select>
<input type="button" value="-->" onClick="createOptions()">
<select name="select2" size="10">
<option>选择项目
<option>---------------
</select>
</form>
</head>
<body>
</body>
</html>