当我们使用 Vuex 实现全局状态维护时，可能需要将状态值划分多个模块，比如一些 root 级的用户登录状态，token，用户级的用户信息，购物车级的购物车信息。
下面我们实例演示下如何在多模块下使用 mapState/mapMutations。
modules 只作用于属性，属性会归属在相应的模块名的命名空间下。
mutations, actions, getter 没有命名空间的限定，所以要保证全局的唯一性，否则后者会覆盖前者
store/index.js
import Vue from 'vue' import Vuex from 'vuex' import user from './user' import order from './order' Vue.use(Vuex) const store = new Vuex.Store({ modules: { user, order }, state: { hasLogin: false, token: "" }, mutations: { setHasLogin(state, hasLogin) { state.hasLogin = hasLogin }, setToken(state, token) { state.token = token } } }) export default store
store/user.js
const state = { name: "sqrtcat", age: 25 } const mutations = { setUserName(state, name) { state.name = name }, setUserAge(state, age) { state.age = age } } const actions = { } const getters = { } export default { state, mutations, actions, getters }
store/order.js
const state = { name: "cart", count: 0 } const mutations = { setOrderName(state, name) { state.name = name }, setOrderCount(state, count) { state.count = count } } const actions = { } const getters = { } export default { state, mutations, actions, getters }
Vue 引入
import Vue from 'vue' import App from './App' import store from './store' Vue.config.productionTip = false Vue.prototype.$store = store // 注入仓库 const app = new Vue({ store// 注入仓库 }) app.$mount()
index.vue
<template> <view> <button @click="setUserName('big_cat')">setUserName</button> <button @click="setUserAge(27)">setUserAge</button> <button @click="setOrderName('yes')">setOrderName</button> <button @click="setHasLogin(true)">setHasLogin</button> <button @click="setToken('tokentokentokentoken')">setToken</button> <view> {{userName}} </view> <view>{{userAge}}</view> <view>{{orderName}}</view> <view>{{hasLogin}}</view> <view>{{token}}</view> </view> </template> <script> import { mapState, mapMutations } from "vuex" export default { data() { return {} }, computed: { // 原生 hasLogin() { return this.$store.state.hasLogin }, token() { return this.$store.state.token } // 仓库root属性 可以直接 magic 赋值 // ...mapState(["hasLogin", "token"]), // 因为 modules 下的属性使用了命名空间 所以不能使用数组方式的 magic ...mapState({ userName: state => state.user.name, userAge: state => state.user.age, orderName: state => state.order.name }), // 更多示例 ...mapState({ hasLogin(state) { return state.hasLogin }, token(state) { return state.token } }), ...mapState({ hasLogin: (state) => { return state.hasLogin }, token: (state) => { return state.token } }), }, methods: { // vuex 在使用了 modules 模式时 // mutation依然没有命名空间的概念 所以在定义 mutations 时要注意全局的唯一性 // 否则后者会覆盖前者 ...mapMutations(["setHasLogin", "setToken"]), // magic style1 ...mapMutations(["setUserName", "setUserAge", "setOrderName"]), // magic style2 ...mapMutations({ setUserName(commit, userName) { commit("setUserName", userName) }, setUserAge(commit, userAge) { commit("setUserAge", userAge) }, setOrderName(commit, orderName) { commit("setOrderName", orderName) } }), // 原生写法 setUserName(userName) { this.$store.commit("setUserName", userName) }, setUserAge(userAge) { this.$store.commit("setUserAge", userAge) }, setOrderName(orderName) { this.$store.commit("setOrderName", orderName) } } } </script>