JS案例：通过函数统计商品的总价
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>创建自定义函数示例</title>
<script type="text/javascript">
function Totel(price,num){
var totel=price*num;
document.write("商品的总价为："+totel);
}
</script>
</head>
<body>
<script type="text/javascript">
//调用函数时用实参代替形参
Totel(2.3,5);
</script>
</body>
</html>
