var myCart = angular.module("myCart", []);
	myCart.controller("myCartController", function($scope) {
		//,{title:'惠普節能檯燈',price:'99.00',num:10,img:'img/3.jpg'}
		$scope.bill = {
			discount: 0
		};
		$scope.cartInfo = [{
			title: '惠普機械鍵盤',
			price: 998.00,
			num: 1,
			img: 'img/1.jpg'
		}, {
			title: '惠普機械滑鼠',
			price: 668.00,
			num: 1,
			img: 'img/2.jpg'
		}, {
			title: '惠普節能檯燈',
			price: '99.00',
			num: 10,
			img: 'img/3.jpg'
		},{
			title: '惠普機械鍵盤',
			price: 998.00,
			num: 1,
			img: 'img/1.jpg'
		}, {
			title: '惠普機械滑鼠',
			price: 668.00,
			num: 1,
			img: 'img/2.jpg'
		}, {
			title: '惠普節能檯燈',
			price: '99.00',
			num: 10,
			img: 'img/3.jpg'
		}]; /*數量相加函式*/
		$scope.jia = function(obj) {
				obj.num = obj.num + 1;
			}
			/*相減函式*/
		$scope.jian = function(obj) {
				if (obj.num > 1) {
					obj.num = obj.num - 1;
				}
			}
			/*移除函式*/
		$scope.remove = function(obj) {
				for (var i = 0; i < $scope.cartInfo.length; i++) {
					if (obj.title === $scope.cartInfo[i].title) {
						$scope.cartInfo.splice(i, 1);
					}
				}
			}
			/*計算總金額*/
		$scope.total = function() {
				var total = 0;
				for (var i = 0; i < $scope.cartInfo.length; i++) {
					total += $scope.cartInfo[i].price * $scope.cartInfo[i].num;
				}
				return total;
			}
			/*實付金額*/
		$scope.subTotal = function() {
			return $scope.total() - $scope.bill.discount;
		}

		function equalTotal(newValue, oldValue, scope) {
			//alert(newValue+"---oldValue--"+oldValue);
			return $scope.bill.discount = newValue > 1000 ? 10 : 0;
		}
		$scope.$watch($scope.total, equalTotal);
	})
 

執行效果如下》》》》》》