```
app/cart.js
```javascript
var app = angular.module('cartApp', []);
app.controller('cartController', function($scope){
$scope.cart = [
{
id: 1000,
name: 'iphone5s',
quantity: 3,
price: 4300
},
{
id: 3300,
name: 'iphone5',
quantity: 30,
price: 3300
},
{
id: 232,
name: 'imac',
quantity: 4,
price: 23000
},
{
id: 1400,
name: 'ipad',
quantity: 5,
price: 6900
}
];
/**
* 计算购物总价
*/
$scope.totalPrice = function () {
var total = 0;
angular.forEach($scope.cart, function (item) {
total += item.quantity * item.price;
})
return total;
}
/**
* 计算总购买数
*/
$scope.totalQuantity = function () {
var total = 0;
angular.forEach($scope.cart, function (item) {
total += parseInt(item.quantity);
})
return total;
}
/**
* 找一个元素的索引
*/
var findIndex = function (id) {
var index = -1;
angular.forEach($scope.cart, function (item, key) {
if (item.id === id) {
index = key;
return;
}
});
return index;
}
/**
* 为某个产品添加一个数量
*/
$scope.add = function (id) {
var index = findIndex(id);
if (index !== -1) {
++$scope.cart[index].quantity;
}
}
/**
* 为某个产品减少一个数量
*/
$scope.reduce = function (id) {
var index = findIndex(id);
if (index !== -1) {
var item = $scope.cart[index];
if(item.quantity > 1){
--item.quantity;
}else{
var returnKey = confirm('是否从购物车内删除该产品!');
if(returnKey){
$scope.remove(id);
}
}
}
}
/**
* 移除一项
*/
$scope.remove = function (id) {
var index = findIndex(id);
// 如果找到了那个item
if (index !== -1) {
$scope.cart.splice(index, 1);
}
// 自动做脏检查
}
// 监听数量 如果小于 1 则让用户判断是否要删除产品
$scope.$watch('cart',function(newValue,oldValue){
angular.forEach(newValue,function(item,key){
if(item.quantity < 1){
var returnKey = confirm('是否从购物车内删除该产品!');
if(returnKey){
$scope.remove(item.id);
}else{
item.quantity = oldValue[key].quantity;
}
}
})
},true);
});
```
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