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Javascript 中的 已知商品单价,用JS计算所选数量的总价


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晚上一个网友要我帮忙写个js算法,虽然自己的JS不是很好,不过题目也算简单,想了半小时就出来了,要求是:定义商品的价格,然后通过选择下拉菜单的数量,得到商品总价.代码如下:

 

<!DOCTYPE HTML PUBLIC "-//W3C//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>