app-AgricultureSmart/uniapp/store/user/cart.js

export default{
    namespaced:true,
    state:()=>({
        //购物车的数组，用来储存购物车中每个商品的信息对象
        //每个商品的信息对象，都包含如下六个属性
        //{goods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_state}
        cart:JSON.parse(uni.getStorageSync('cart')||'[]')
    }),

    mutations:{
        addToCart(state,goods){
            const findResult = state.cart.find(x => x.goods_id===goods.goods_id)
            //console.log(findResult);
            if(!findResult){
                state.cart.push(goods)
            }
            else{
                findResult.goods_count++
            }
            //console.log(state.cart);
            this.commit('m_cart/saveToStorage')
        },
        saveToStorage(state){
            uni.setStorageSync('cart',JSON.stringify(state.cart))
        },
        //更新购物车中商品的勾选状态
        updateGoodsState(state,goods){
            const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
            //console.log(findResult);
            if(findResult){

                findResult.goods_state=goods.goods_state
                //持久化储存本地
                this.commit('m_cart/saveToStorage')

            }
        },
        //更新商品的数量
        updateGoodsCount(state,goods){
            const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
            if(findResult){
                findResult.goods_count=goods.goods_count

                this.commit('m_cart/saveToStorage')
            }
        },
        //根据ID删除对应的商品
        removeGoodsById(state,goods_id){
            state.cart = state.cart.filter(x=>x.goods_id!==goods_id)
            this.commit('m_cart/saveToStorage')
        },
        //更新购物车中所有 商品的勾选状态
        updateAllGoodsState(state,newState){
            state.cart.forEach(x=>x.goods_state = newState)
            this.commit('m_cart/saveToStorage')
        },
        //清空购物车
        clearCart(state){
            state.cart = []
            this.commit('m_cart/saveToStorage')
        }
    },
    getters:{
        //购物车所有商品的总数量
        total(state){
            // let c=0
            // state.cart.forEach(x=>c+=x.goods_count)
            // return c
            return state.cart.reduce((total,item)=>total+=item.goods_count,0)
        },
        //购物车中已勾选商品的数量
        checkedCount(state){
            return state.cart.filter(x=>x.goods_state).reduce((total,item)=> total += item.goods_count,0)
        },
        //以勾选商品的总价格
        checkedGoodsAmount(state){
            return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count*item.goods_price,0).toFixed(2)
        },
        getCart(state){
            return state.cart
        }
    }
}