<input type="button" onclick="getOptions()" value="输出所有选项">
<html>
<head>
<script type="text/javascript">
function getOptions()
{
var x=document.getElementById("mySelect");
var y="";
for (i=0;i<x.length;i++)
y+=x.options[i].text;
y+="<br />";
}
document.write(y);
</script>
</head>
<body>
<form>
请选择您喜欢的水果：
<select id="mySelect">
<option>苹果</option>
<option>桃子</option>