纯js实现的购物车结算功能

使用方法

var cartController = function($scope){
	$scope.cart = [
		{
			id:100,
			name:'iphone5s',
			quantity:2,
			price:4300
		},
		{
			id:130,
			name:'iphone5',
			quantity:1,
			price:2100			
		},
		{
			id:200,
			name:'imac',
			quantity:5,
			price:14300
		},
		{
			id:110,
			name:'ipid',
			quantity:30,
			price:3300
		}
	];
	//总购买数量
	$scope.totalQuantity = function(){
		var total = 0;
		angular.forEach($scope.cart,function(item){
			total += parseInt(item.quantity);
		});
		return total;
	};
	//总购买价格
	$scope.totalPrice = function(){
		var total = 0;
		angular.forEach($scope.cart,function(item){
			total += parseInt(item.quantity*item.price);
		});
		return total;
	};
	//找一个项目
	$scope.findItem = function(id){
		var index = -1;
		angular.forEach($scope.cart, function(item, key){
			if(item.id === id){
				index = key;
				return;
			};
		});
		return index;
	};
	//移除table
	$scope.remove = function(id){
		var index = $scope.findItem(id);
		if(index !== -1){
			$scope.cart.splice(index,1);	
		};
	};
	//减少一个商品数量
	$scope.reduce = function(id){
		var index = $scope.findItem(id);
		if(index !== -1){
			var item = $scope.cart[index]
			if(item.quantity>1){
				--item.quantity;
			} else{
				var returnKey = confirm("是否从购物车中删除该产品！");
				if(returnKey){
					$scope.remove(id);
				}
			}	
		}
	};
	//增加一个商品数量
	$scope.add = function(id){
		var index = $scope.findItem(id);
		if(index !== -1){
			++$scope.cart[index].quantity;	
		};	
	};
	$scope.$watch('cart',function(newvalue,oldvalue){
		angular.forEach(newvalue, function(item, key){
			if(item.quantity < 1 && item.quantity!==''){
				var returnKey = confirm("是否从购物车中删除该产品！");
				if(returnKey){
					$scope.remove(id);
				}else{
					item.quantity = oldvalue[key].quantity;
				};
			};
		});
	},true);
}