<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 })