Vuex模块化和命名空间namespaced实例演示
1. 目的:
让代码更好维护,让多种数据分类更加明确。
2. 修改store/index.js
store/index.js
const countAbout = { namespaced:true,//开启命名空间 state:{x:1}, mutations: { ... }, actions: { ... }, getters: { bigSum(state){ return state.sum * 10 } } } const personAbout = { namespaced:true,//开启命名空间 state:{ ... }, mutations: { ... }, actions: { ... } } const store = new Vuex.Store({ modules: { countAbout, personAbout } })
注意: namespaced:true,
要开启命名空间
3. 开启命名空间后,组件中读取state数据:
//方式一:自己直接读取 this.$store.state.personAbout.list //方式二:借助mapState读取: ...mapState('countAbout',['sum','school','subject']),
4. 开启命名空间后,组件中读取getters数据:
//方式一:自己直接读取 this.$store.getters['personAbout/firstPersonName'] //方式二:借助mapGetters读取: ...mapGetters('countAbout',['bigSum'])
5. 开启命名空间后,组件中调用dispatch
//方式一:自己直接dispatch this.$store.dispatch('personAbout/addPersonWang',person) //方式二:借助mapActions: ...mapActions('countAbout',{incrementOdd:'jiaOdd',incrementWait:'jiaWait'})
开启命名空间后,组件中调用commit
//方式一:自己直接commit this.$store.commit('personAbout/ADD_PERSON',person) //方式二:借助mapMutations: ...mapMutations('countAbout',{increment:'JIA',decrement:'JIAN'}),
例子:
Fenix:
总代码:
main.js
//引入Vue import Vue from 'vue' //引入App import App from './App.vue' //引入store import store from './store' //关闭Vue的生产提示 Vue.config.productionTip = false //创建vm new Vue({ el:'#app', render: h => h(App), store, beforeCreate() { Vue.prototype.$bus = this } })
App.js
<template> <div> <Count/> <hr> <Person/> </div> </template> <script> import Count from './components/Count' import Person from './components/Person' export default { name:'App', components:{Count,Person}, } </script>
store/index.js
//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' import countOptions from './count' import personOptions from './person' //应用Vuex插件 Vue.use(Vuex) //创建并暴露store export default new Vuex.Store({ modules:{ countAbout:countOptions, personAbout:personOptions } })
store/count.js
//求和相关的配置 export default { namespaced:true, actions:{ 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) } }, 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 }, }, state:{ sum:0, //当前的和 school:'尚硅谷', subject:'前端', }, getters:{ bigSum(state){ return state.sum*10 } }, }
store/person.js
//人员管理相关的配置 import axios from 'axios' import { nanoid } from 'nanoid' export default { namespaced:true, actions:{ addPersonWang(context,value){ if(value.name.indexOf('王') === 0){ context.commit('ADD_PERSON',value) }else{ alert('添加的人必须姓王!') } }, addPersonServer(context){ axios.get('https://api.uixsj.cn/hitokoto/get?type=social').then( response => { context.commit('ADD_PERSON',{id:nanoid(),name:response.data}) }, error => { alert(error.message) } ) } }, mutations:{ ADD_PERSON(state,value){ console.log('mutations中的ADD_PERSON被调用了') state.personList.unshift(value) } }, state:{ personList:[ {id:'001',name:'张三'} ] }, getters:{ firstPersonName(state){ return state.personList[0].name } }, }
components/Count.vue
<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('countAbout',['sum','school','subject']), ...mapState('personAbout',['personList']), //借助mapGetters生成计算属性,从getters中读取数据。(数组写法) ...mapGetters('countAbout',['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('countAbout',{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('countAbout',{incrementOdd:'jiaOdd',incrementWait:'jiaWait'}) }, mounted() { console.log(this.$store) }, } </script> <style lang="css"> button{ margin-left: 5px; } </style>
components/Person.vue
<template> <div> <h1>人员列表</h1> <h3 style="color:red">Count组件求和为:{{sum}}</h3> <h3>列表中第一个人的名字是:{{firstPersonName}}</h3> <input type="text" placeholder="请输入名字" v-model="name"> <button @click="add">添加</button> <button @click="addWang">添加一个姓王的人</button> <button @click="addPersonServer">添加一个人,名字随机</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.$store.state.personAbout.personList }, sum(){ return this.$store.state.countAbout.sum }, firstPersonName(){ return this.$store.getters['personAbout/firstPersonName'] } }, methods: { add(){ const personObj = {id:nanoid(),name:this.name} this.$store.commit('personAbout/ADD_PERSON',personObj) this.name = '' }, addWang(){ const personObj = {id:nanoid(),name:this.name} this.$store.dispatch('personAbout/addPersonWang',personObj) this.name = '' }, addPersonServer(){ this.$store.dispatch('personAbout/addPersonServer') } }, } </script>
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