Angular.js用法（二）：购物车数量加减及总价计算

1、下载后引入angular.min.js
2、代码如下：

<h1>计算商品价格</h1>
<div ng-app="buy" ng-controller="contro">
    <p>
        <button ng-click="decr()">-</button>
        <input type="text" ng-model="num" readonly>
        <button ng-click="incr()">+</button>
    </p>
    <p>{{num*8}}</p>
</div>
<script>var app = angular.module('buy' , []);
    app.controller('contro',function($scope){
        $scope.num=1;
        $scope.incr=function(){
            this.num += 1;
        }
        $scope.decr=function(){
            //只有大于一的时候才减
            if(this.num>1){
                this.num -= 1;
            }
        }
    });
</script>