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DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>hello,yang</title>
</head>
<body>
<script type="text/javascript">
function change(a){
var newp = 200*a
var price = document.getElementById("price");
price.setAttribute("value",newp)
}
</script>
<select onChange="change(this.value)">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select><input type="text" value="200" id=price>
</body>
</html> （出处：网易博客）
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