_src_求和案例_多组件共享数据

<template>
    <div>
        <h1>当前求和为：{{sum}}</h1>
        <h3>当前求和放大10倍为：{{bigSum}}</h3>
        <h3>我在{{school}}，学习{{subject}}</h3>
        <h3 style="color:red">Person组件的总人数是：{{personList.length}}</h3>
        <select v-model.number="n">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select>
        <button @click="increment(n)">+</button>
        <button @click="decrement(n)">-</button>
        <button @click="incrementOdd(n)">当前求和为奇数再加</button>
        <button @click="incrementWait(n)">等一等再加</button>
    </div>
</template>

<script>
    import {mapState,mapGetters,mapMutations,mapActions} from 'vuex'
    export default {
        name:'Count',
        data() {
            return {
                n:1, //用户选择的数字
            }
        },
        computed:{
            //借助mapState生成计算属性，从state中读取数据。（数组写法）
            ...mapState(['sum','school','subject','personList']),
            //借助mapGetters生成计算属性，从getters中读取数据。（数组写法）
            ...mapGetters(['bigSum'])
        },
        methods: {
            //借助mapMutations生成对应的方法，方法中会调用commit去联系mutations(对象写法)
            ...mapMutations({increment:'JIA',decrement:'JIAN'}),
            //借助mapActions生成对应的方法，方法中会调用dispatch去联系actions(对象写法)
            ...mapActions({incrementOdd:'jiaOdd',incrementWait:'jiaWait'})
        },
        mounted() {
            // const x = mapState({he:'sum',xuexiao:'school',xueke:'subject'})
            // console.log(x)
        },
    }
</script>

<style lang="css">
    button{
        margin-left: 5px;
    }
</style>

<template>
    <div>
        <h1>人员列表</h1>
        <h3 style="color:red">Count组件求和为：{{sum}}</h3>
        <input type="text" placeholder="请输入名字" v-model="name">
        <button @click="add">添加</button>
        <ul>
            <li v-for="p in personList" :key="p.id">{{p.name}}</li>
        </ul>
    </div>
</template>

<script>
    import {nanoid} from 'nanoid'
    export default {
        name:'Person',
        data() {
            return {
                name:''
            }
        },
        computed:{
            personList(){
                return this.$store.state.personList
            },
            sum(){
                return this.$store.state.sum
            }
        },
        methods: {
            add(){
                const personObj = {id:nanoid(),name:this.name}
                this.$store.commit('ADD_PERSON',personObj)
                this.name = ''
            }
        },
    }
</script>

//该文件用于创建Vuex中最为核心的store
import Vue from 'vue'
//引入Vuex
import Vuex from 'vuex'
//应用Vuex插件
Vue.use(Vuex)

//准备actions——用于响应组件中的动作
const actions = {
    /* jia(context,value){
        console.log('actions中的jia被调用了')
        context.commit('JIA',value)
    },
    jian(context,value){
        console.log('actions中的jian被调用了')
        context.commit('JIAN',value)
    }, */
    jiaOdd(context,value){
        console.log('actions中的jiaOdd被调用了')
        if(context.state.sum % 2){
            context.commit('JIA',value)
        }
    },
    jiaWait(context,value){
        console.log('actions中的jiaWait被调用了')
        setTimeout(()=>{
            context.commit('JIA',value)
        },500)
    }
}
//准备mutations——用于操作数据（state）
const mutations = {
    JIA(state,value){
        console.log('mutations中的JIA被调用了')
        state.sum += value
    },
    JIAN(state,value){
        console.log('mutations中的JIAN被调用了')
        state.sum -= value
    },
    ADD_PERSON(state,value){
        console.log('mutations中的ADD_PERSON被调用了')
        state.personList.unshift(value)
    }
}
//准备state——用于存储数据
const state = {
    sum:0, //当前的和
    school:'尚硅谷',
    subject:'前端',
    personList:[
        {id:'001',name:'张三'}
    ]
}
//准备getters——用于将state中的数据进行加工
const getters = {
    bigSum(state){
        return state.sum*10
    }
}

//创建并暴露store
export default new Vuex.Store({
    actions,
    mutations,
    state,
    getters
})