vuex实例

1，vue-cli创建项目
(1) npm install -g vue-cli
如果安装失败，可以使用npm cache clean 清理缓存，然后再重新安装。
(2) vue -V 查看是否安装成功
(3) 初始化项目vue init webpack vue-project

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(4) 安装vuex npm install vuex --save
(5) 在src目录下新建文件夹store
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(6) 路由配置 router---index.js

import Vue from 'vue'
import Router from 'vue-router'
import HomeA from '@/components/home/HomeA'
import HomeB from '@/components/home/HomeB'

Vue.use(Router)

export default new Router({
  routes: [
    {
      path: '/',
      name: 'HomeA',
      component: HomeA
    },
    {
      path: '/home/HomeA',
      name: 'HomeA',
      component: HomeA
    },
    {
      path: '/home/HomeB',
      name: 'HomeB',
      component: HomeB
    }
  ]
})

(7)
store.js

import Vue from 'vue'
import Vuex from 'vuex'
import * as getters from './getters' // 导入响应的模块，*相当于引入了这个组件下所有导出的事例
import * as actions from './actions'
import * as mutations from './mutations'

Vue.use(Vuex)

// 首先声明一个需要全局维护的状态state
const state = {
  newName: '新名字',
  id: '123'
}

// 注册上边引入的各大模块
const store = new Vuex.Store({
  state, // 共同维护的一个状态，state里面可以是很多个全局状态
  getters, // 获取数据并渲染
  actions, // 数据的异步操作
  mutations// 处理数据的唯一途径，state的改变和赋值都在这里
})

export default store
// 导出store，并在main.js中引用注册

actions.js

// 给action注册事件处理函数，当这个函数被触发时候，将状态提交到mutations中处理
export function modifyAName ({commit}, name) {
  return commit('modifyAName', name)
}

// export function modifyBName ({commit}, name) {
//   return commit('modifyBName', name)
// }

export const modifyBName = ({commit}, name) => commit('modifyBName', name)

mutations.js

export const modifyAName = (state, name) => { // A组件点击更改名称为A
  state.newName = name // 把方法传递过来的参数，赋值给state中的newName
}

export const modifyBName = (state, name) => {
  state.newName = name
}

getters.js

// 获取最终的状态信息
export const newName = state => state.newName

在main.js中导入store实例

import Vue from 'vue'
import App from './App'
import router from './router'
import store from './store'

Vue.config.productionTip = false

/* eslint-disable no-new */
new Vue({
  el: '#app',
  router,
  store, // 全局使用vuex
  components: { App },
  template: '<App/>'
})

(8)组件A

<template>
  <div class="componentsA">
    <P class="title">组件A</P>
    <P class="titleName">名称：{{newName}}</P>
    <div>
      <!-- 点击修改 为 A  -->
      <button class="btn" @click="modifyAName('AAA')">修改为AAAA</button>
    </div>
    <div class="marTop">
      <button class="btn" @click="trunToB">跳转到B页面</button>
    </div>
  </div>
</template>

<script>
import {mapActions, mapGetters} from 'vuex'
export default {
  name: 'HomeA',
  data () {
    return {
    }
  },
  methods: {
    ...mapActions( // 语法糖
      ['modifyAName'] // 相当于this.$store.dispatch('modifyName'),提交这个方法
    ),
    trunToB () {
      this.$router.push({path: '/home/HomeB'}) // 路由跳转到B
    }
  },
  computed: {
    ...mapGetters(['newName']) // 动态计算属性，相当于this.$store.getters.resturantName
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
  .title,.titleName{
    color: blue;
    font-size: 20px;
  }
  .btn{
    width: 160px;
    height: 40px;
    background-color: blue;
    border: none;
    outline: none;
    color: #ffffff;
    border-radius: 4px;
  }
  .marTop{
    margin-top: 20px;
  }
</style>

(9) 组件B

<template>
  <div class="componentsB">
    <P class="title">组件B</P>
    <P class="titleName">名称：{{newName}}</P>
    <div>
      <!-- 点击修改 为 B  -->
      <button class="btn" @click="modifyBName('BBB')">修改为BBBB</button>
    </div>
    <div class="marTop">
      <button class="btn" @click="trunToA">跳转到A页面</button>
    </div>
  </div>
</template>

<script>
import {mapActions, mapGetters} from 'vuex'
export default {
  name: 'HomeB',
  data () {
    return {
    }
  },
  methods: {
    ...mapActions( // 语法糖
      ['modifyBName'] // 相当于this.$store.dispatch('modifyName'),提交这个方法
    ),
    trunToA () {
      this.$router.push({path: '/home/HomeA'}) // 路由跳转到A
    }
  },
  computed: {
    ...mapGetters(['newName']) // 动态计算属性，相当于this.$store.getters.resturantName
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
  .title,.titleName{
    color: red;
    font-size: 20px;
  }
  .btn{
    width: 160px;
    height: 40px;
    background-color: red;
    border: none;
    outline: none;
    color: #ffffff;
    border-radius: 4px;
  }
  .marTop{
    margin-top: 20px;
  }
</style>

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参考出处