angularJs购物金额实例操作

<!DOCTYPE HTML>
<html ng-app>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script src="angular.min.js"></script>
<script>
    function Aaa($scope,$timeout){
        $scope.iphone = {
            money : 5000,
            num : 1,
            fre : 10
        };
        $scope.sum = function(){
            return $scope.iphone.money * $scope.iphone.num;
        };

        /*$scope.$watch('iphone.money',function(newVal,oldVal){     //iphone.money这里表示监听的是money这个输入框
            console.log(newVal);    //计算后的值，被监听的那个的值
            console.log(oldVal);    //计算前的值，被监听的那个的值
        },true);*/

        $scope.$watch($scope.sum,function(newVal,oldVal){        //$watch监听的意思，还可以监听函数
            //console.log(newVal);
            //console.log(oldVal);

            $scope.iphone.fre = newVal >= 100 ? 0 : 10;
        });
    }
</script>
</head>
<body>
    <div ng-controller="Aaa">
        <p>价格:<input type="text" ng-model="iphone.money"></p>
        <p>个数:<input type="text" ng-model="iphone.num"></p>
        <p>费用:<span>{{ sum() | currency:'￥' }}</span></p>    <!--currency 这是一个过滤器，货币格式化的方法，默认是美元符号-->
        <p>运费:<span>{{iphone.fre | currency:'￥'}}</span></p>
        <p>总额:<span>{{ sum() + iphone.fre | currency:'￥'}}</span></p>
    </div>
</body>
</html>