vuex使用示例

项目代码结构↓

src内容↓

store内容↓

理解思路: component中的组件发送修改请求，由action.js处理请求，mutation修改请求，修改请求后state改变，从getter.js中可获取更新后的state中的数据。

state.js中为初始数据

const state={
  count:0
};

export default state;

action.js中的内容

import * as types from './types';

const actions={
  increment:({
    commit,state
  },payload)=>{
    // alert(payload);
    payload=payload||1;
    commit(types.INCREMENT,payload);
  },
  decrement:({
    commit,state
  })=>{
    commit(types.DECREMENT);
  },
  async:({
    commit,state
  })=>{
    setTimeout(()=>{//请求数据
      commit(types.INCREMENT);
    },1000);
  },
  odd:({
    commit,state
  })=>{
    if(state.count % 2 == 0){
      commit(types.INCREMENT);
    }
  }
};

export default actions;

mutation.js的内容

import {
  INCREMENT,
  DECREMENT
} from './types';

const mutations={
  [INCREMENT]:(state,payload)=>{
    // alert(payload);
    payload=payload||1;
    state.count+=payload;
  },
  [DECREMENT]:(state)=>{
    state.count--;
  }
};

export default mutations;

type.js的内容

export const INCREMENT='INCREMENT'; //加  描述
export const DECREMENT='DECREMENT'; //减  描述

getter.js的内容

const getters={
  count:(state)=>{
    return state.count;
  }
};

export default getters;

在App.vue(或其他组件)中获取、修改state中的状态↓

<template>
  <div id="app">
    <h1>vuex</h1>
    <input type="button" value="+" @click="increment(2)">
    <input type="button" value="-" @click="decrement">
    <input type="button" value="异步+" @click="async">
    <input type="button" value="偶数+" @click="odd">
    <br/>
    越过getters向state拿：{{$store.state.count}}
    <br/>
    {{count}}/{{count%2==0?'双数':'单数'}}
    <br/>
    <input type="button" value="修改私有数据" @click="check">
    <br/>
    {{n}}
  </div>
</template>

<script>
 import {mapActions,mapGetters} from 'vuex';
export default {
  name: 'app',
  data () {
    return {
      n:0
    }
  },
  methods:{ // 私有方法和 请求并存
    check(){
      this.n='bmw';
    },
...mapActions(
      ['increment','decrement','async','odd']
    )
  },
  computed:mapGetters(
    ['count']
  ),

  mounted(){
    //代码里面直接发请求 actions
//    this.$store.dispatch('increment',121);

    //代码里面直接发请求 mutations
//    this.$store.commit('INCREMENT',['apple','banana','orange','西游记']);

  }
}
</script>

<style>

</style>