<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>
        <select v-model.number="n">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select>
        <button @click="increment">+</button>
        <button @click="decrement">-</button>
        <button @click="incrementOdd">当前求和为奇数再加</button>
        <button @click="incrementWait">等一等再加</button>
    </div>
</template>

<script>
    import {mapState,mapGetters} from 'vuex'
    export default {
        name:'Count',
        data() {
            return {
                n:1, //用户选择的数字
            }
        },
        computed:{
            //靠程序员自己亲自去写计算属性
            /* sum(){
                return this.$store.state.sum
            },
            school(){
                return this.$store.state.school
            },
            subject(){
                return this.$store.state.subject
            }, */

            //借助mapState生成计算属性,从state中读取数据。(对象写法)
            // ...mapState({he:'sum',xuexiao:'school',xueke:'subject'}),

            //借助mapState生成计算属性,从state中读取数据。(数组写法)
            ...mapState(['sum','school','subject']),

            /* ******************************************************************** */

            /* bigSum(){
                return this.$store.getters.bigSum
            }, */

            //借助mapGetters生成计算属性,从getters中读取数据。(对象写法)
            // ...mapGetters({bigSum:'bigSum'})
            
            //借助mapGetters生成计算属性,从getters中读取数据。(数组写法)
            ...mapGetters(['bigSum'])

        },
        methods: {
            increment(){
                this.$store.commit('JIA',this.n)
            },
            decrement(){
                this.$store.commit('JIAN',this.n)
            },
            incrementOdd(){
                this.$store.dispatch('jiaOdd',this.n)
            },
            incrementWait(){
                this.$store.dispatch('jiaWait',this.n)
            },
        },
        mounted() {
            const x = mapState({he:'sum',xuexiao:'school',xueke:'subject'})
            console.log(x)
        },
    }
</script>

<style lang="css">
    button{
        margin-left: 5px;
    }
</style>
//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
    }
}
//准备state——用于存储数据
const state = {
    sum:0, //当前的和
    school:'尚硅谷',
    subject:'前端'
}
//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
})

 

posted on 2022-06-01 20:50  weakup  阅读(22)  评论(0编辑  收藏  举报