Vuex安裝

npm n install vuex --save

Vuex使用案列

• store/index.js

import Vue from 'vue'
import Vuex from 'vuex'
import getters from './getters';

Vue.use(Vuex)

// https://webpack.js.org/guides/dependency-management/#requirecontext
const modulesFiles = require.context('./modules', true, /\.js$/)

// you do not need `import app from './modules/app'`
// it will auto require all vuex module from modules file
const modules = modulesFiles.keys().reduce((modules, modulePath) => {
  // set './app.js' => 'app'
  const moduleName = modulePath.replace(/^\.\/(.*)\.\w+$/, '$1')
  const value = modulesFiles(modulePath)
  modules[moduleName] = value.default
  return modules
}, {})



export default new Vuex.Store({
    modules,
    getters
})

• store/getters.js

const getters = {
    username:state => state.user.username,
}
export default getters

• store/modules/user.js

const types = {
    SET_USERNAME: 'SET_USERNAME', // 用戶名稱
}

const state = {
    username: ''
}

const mutations = {
    [types.SET_USERNAME](state, username) {
        state.username = username;
    },
};

const actions = {
    /**登錄 */
    login({ commit, state },userInfo){
        return new Promise((resolve, reject) => {
            // login(state.userInfo).then(res=>{
            //     resolve();
            // }).catch(err=>{
            //     reject(err)
            // })
        })
    }
}
export default {
    //namespaced這是屬性用于解決不同模塊的命名沖突問題,在不同頁面引入getter、actions、mutations時，要加上模塊名
    namespaced: true,
    state,
    mutations,
    actions
}

注意：最后在main.js中引入

在模塊中使用mapState，mapGetters，mapMutations，mapActions

import { mapState, mapGetters, mapActions } from "vuex"
...

computed: {
    ...mapState({
      username: state => state.user.username
    }),
    ...mapGetters(["username"])
},

...

methods:{
    ...mapActions('user',['login']),
    //或者用以下方法使用子模塊中的Action
    // ...mapActions({
    //   loginOut: "user/loginOut"
    // }),
}

...