vuex状态管理
Posted tommymarc
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状态管理bus
//通过在lib 创建bus.js,作为一个bus状态管理模块 import Vue from ‘vue‘ const Bus = new Vue() export default Bus
//a.vue <template> <div> <button @click="handleClick">按我</button> </div> </template> <script> export default { methods:{ handleClick(){ this.$bus.$emit(‘on-click‘,‘hello‘) } }, mounted(){ console.log(this.$bus); } } </script>
//b.vue <template> <div class="tel"> {{message}} </div> </template> <script> export default { data(){ return { message:‘‘ } }, mounted(){ this.$bus.$on(‘on-click‘,mes=>{ this.message = mes }) } } </script>
通过store 集中管理
- actions:异步操作处理 接口数据
- mutations:修改值
- state: 修改后值
- modules:存储特定模块的参数
入口 /index.js
import Vue from ‘vue‘ import Vuex from ‘vuex‘ import state from ‘./state‘ import mutations from ‘./mutations‘ import actions from ‘./actions‘ import getters from ‘./getters‘ import user from ‘./module/user‘ Vue.use(Vuex) export default new Vuex.Store({ state, getters, mutations, actions, modules:{ user } })
actions
import { getAppName } from ‘@/api/app.js‘ const actions = { /* updateAppName({commit}){ //方法 // const commit = paramsObj.commit getAppName().then(res=>{// 模拟异步操作 const { code, info:{appName}} = res commit(‘SET_APP_NAME‘,appName) console.log(res); // commit(‘SET_APP_NAME‘,res.info.appName) }).catch(err=>{ console.log(err); }) } */ async updateAppName({commit}){ try{ const {info:{appName}} = await getAppName(); commit(‘SET_APP_NAME‘,appName) } catch(err){ console.log(err); } } } export default actions
mutations
import vue from ‘vue‘ const mutations = { SET_APP_NAME(state,params){ // params 载赫,参数 state.appName = params }, SET_APP_VERSION(state){ vue.set(state,‘appVersion‘,‘V10.0‘) } } export default mutations
state
const state ={ appName:‘admin‘ } export default state
modules / user
在store内,可创建储存独立模块参数user,放至modules文件中
const state ={ userName:‘tommy‘ } const getters ={ firstLetter: (state) =>{ return state.userName.substr(0,1) } } const mutations = { SET_USER_NAME(state,params){ state.userName =params } } const actions = { updateUserName({commit,state,rootState,dispatch}){ //提交mutations state 指代当前实例 rootstate 根state // rootState.appName //dispatch(‘xxx‘,‘‘) }, /* xxx(){ } */ } export default { namespaced:true, //只限于当前模块 getters, state , mutations, actions }
页面组件模块 store.vue
<template> <div> <!-- <a-input @input="inputValue" :value="inputValue"/> --> <a-input @input="handleInput"/> <!-- <a-input v-model="inputValue"/> --> <p>{{inputValue}} inputValueLastLetter is {{inputValueLastLetter}}</p> <p>{{inputValue}}</p> <p>userName:{{userName}}</p> <p>appName:{{appName}}</p> <p>appNameWithVersion:{{appNameWithVersion}}</p> <p>firstLetter:{{firstLetter}}</p> <button @click="handleChangeAppName">修改appName</button> <!-- <a-show :content="inputValue"/> --> <p>{{appVersion}}</p> <button @click="changeUserName">修改用户名</button> <button @click="asyncChangeAppName">异步修改appName</button> </div> </template> <script> import AInput from ‘../components/AInput.vue‘ import AShow from ‘../components/AShow.vue‘ import { mapState ,mapGetters ,mapMutations ,mapActions} from ‘vuex‘ export default { data(){ return { inputValue:‘‘ } }, components:{ AInput, AShow }, methods:{ handleInput(val){ this.inputValue = val }, /* handleChangeAppName(){ this.$store.commit(‘SET_APP_NAME‘,this.inputValue), this.$store.commit(‘SET_APP_VERSION‘) } */ ...mapMutations(‘user‘,[ ‘SET_USER_NAME‘ ]), ...mapMutations([ ‘SET_APP_NAME‘, ]), handleChangeAppName(){ this.SET_APP_NAME(this.inputValue); }, changeUserName(){ this.SET_USER_NAME(‘vue-version‘) }, ...mapActions([ ‘updateAppName‘ ]), asyncChangeAppName(){ this.updateAppName() // this.$store.dispatch(‘updateAppName‘,‘123‘) } }, computed:{ /* ...mapState({ userName:state=>state.user.userName, appName:state=>state.appName }), */ /* ...mapState(‘user‘,{ userName:state => state.userName }), */ appName(){ return this.$store.state.appName }, /* appName:{ set:function(newValue){ this.inputValue = newValue +‘....set‘ }, get:function(){ return this.inputValue +‘...get‘ } } */ userName(){ return this.$store.state.user.userName }, ...mapGetters(‘user‘,[ ‘firstLetter‘ ]), /* firstLetter(){ return this.userName.substr(0,1) }, */ ...mapGetters([ ‘appNameWithVersion‘, ]), ...mapState({ appVersion:state=>state.appVersion }), /* appNameWithVersion(){ return this.$store.getters.appNameWithVersion }, */ inputValueLastLetter(){ return this.inputValue.substr(-1,1) } } } </script>
初期定义store内的state,视图会渲染;后期定义响应,store内的state,需定义set、get才会渲染
因此需要在mutations中set、get所需修改的state
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