JS案例：定义函数，实现计算商品总价
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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 Total(){
var price=2.3;
var num=4;
var total=price*num;
document.write("商品的总价为："+total);
}
</script>
</head><body></body></html>
