<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<select size="1" id="qq" onchange="change()">
<option selected="selected" value="11">汉堡</option>
<option value="22">鸡腿</option>
<option value="33">可乐</option>
</select><br />
<br />
<p id="pp" style="font-size:24px; color:red;">价格：8元</p>
</body>
</html>
<script>
function change()
{
var a = document.getElementById("qq").value;
var p =document.getElementById("pp");
if(a=="11")
{
p.innerHTML="价格：8元";
}
else if(a=="22")
{
p.innerHTML="价格：10元";
}
else
{
p.innerHTML="价格：3元";
}
}
</script>
