个人玩耍VUE..我的点点滴滴，今天很冷，2度!!!

谢谢博客园，可以记录我的点点滴滴。！！这个小案例的效果图

其中，这篇还是上一篇博客的序章，我们直接看下更新的代码。

Cart.Vue

<template>
    <div class="container">
        <table class="table table-bordered">
            <thead>
                <th style="width:100px"></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
                <th></th>
            </thead>
            <tbody>
                <tr v-for="item in Cart.Items" :key="item.id">
                    <td >
                        <img :src="item.product.Picture.url" class="img img-thumbnail" width="100" >
                    </td>
                    <td>
                        <h5>{{item.product.name}}</h5>
                        <p>{{item.product.description}}</p>
                    </td>
                    <td>
                        {{item.product.price}}
                    </td>
                    <td>
                        {{item.count}}
                    </td>
                    <td>
                        {{item.price}}
                    </td>
                    <td>
                        <button class="btn btn-danger btn-sm" @click="DelCart(item)">删除</button>
                    </td>
                </tr>
            </tbody>
        </table>
        共计:{{Cart.SumPrice}}
    </div>
</template>
<script>
export default {
    computed:{
        Cart(){
            return{
                Items:this.$store.getters.CAST_LIST,
                SumPrice:this.$store.state.Cart.SumPrice
            }
        }
    },
    created(){
        if(this.$store.state.User.user===null){
            this.$router.push('/login');
            return;
        }
        this.$store.dispatch('GET_CART_BY_USERID',this.$store.state.User.user.id);
    },
    methods:{
        DelCart(Item){
            console.log(Item);
            this.$store.dispatch('DELETE_ITEM',Item);
        }
    }
}
</script>

　　Cart.js

import API from '../../utils/api'
 
var api = new API('cart');
 
const state={
    List:[],
    LocalList:[],
    SumPrice:0 // 购物车总价格
}
const mutations={
    PUSH_ITEM(state,item){
        state.List.push(item);
        state.SumPrice+=item.price;
    },
    REDUCT_ITEM(state,item){
        let index = state.List.findIndex(i=>i.id==item.id);
        state.List.splice(index,1);
        state.SumPrice-=item.price;
    }
}
const actions={
    ADD_TO_CARD({commit},cartItem){
        return api.Insert(cartItem).then(res=>{
            if(res){
                return 'OK';
            }
        }).catch(err=>{
            return err;
        })
    },
    //获取查询对象 这个方法一定要在vue模块中先执行。‘
    GET_CART_BY_USERID({commit,state},uid){
        state.List = [];
        state.SumPrice = 0;
        api.Select().then(res=>{
            for(let item of res.data){
                if(item.userInfo == uid){
                    commit('PUSH_ITEM',item)
                }
            }
        })
    },
    DELETE_ITEM({commit},cartItem){
        api.Delete(cartItem.id).then(res=>{
            console.log(res.data);
            commit('REDUCT_ITEM',cartItem);
        })
    }
}
const getters={
    CAST_LIST(state){
        return state.List;
    }
}
 
export default {
    state,mutations,actions,getters
}

个人对Vuex四大核心的认识，state是存放数据的地方，而actions是异步操作干的事情，而异步操作对掠夺略少都有对数据的操作，这个时候就要用到mutations，它在其中对数据进行了操作，那么在定义actions的时候，方法上的参数一定要有commit，它是对数据进行回滚的，而mutations中的方法一定要state，它肯定是对数据进行操作的；getters的能力就是公开属性，它常用于vue模块中计算属性的配合使用（computed）.