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vuex简介

vuex的状态管理

vuex几大核心内容

store文件夹的index.js文件 使用vuex的步骤

state模块

state就是保存一些变量，所有vue的组件都能共享

// 保存状态
  state: {
    counter:1000,
    students:[
      {id:110,name:'lizhi',age:18},
      {id:111,name:'theshy',age:22},
      {id:112,name:'zouxinxin',age:38},
    ],
    info:{
      name:"caixukun",
      hobbis:['rap','basketball'],
      age:22
    }
  },

mutations模块

mutations怎么传递参数

mutations提交风格

mutations响应规则

mutations常量类型细节编程

mutations同步函数

getters模块

Actions模块

module模块

详细代码

store/index.js

import Vue from 'vue'
import Vuex from 'vuex'

import {
  INCREMENT
} from './mutations-types'

// 1，安装插件
Vue.use(Vuex)

// 2，创建并导出对象

// 2.1创建module对象
const moduluA = {
  state: {
    name: 'Sutter'
  },
  mutations: {
    UpdateName(state,payload){
      state.name = payload
    }

  },
  actions: {
    aUpdateName(context){
      setTimeout(()=>{
        context.commit('UpdateName','wangf')
      },1000)
     
    }
  },
  getters: {
    fullname(state){
      return state.name+ '11111'
    },
    fullName(state,getters){
      return getters.fullname + '2222'
    },
    newFullname(state,getters,rootState){
      return getters.fullName+rootState.info.name
    }
  }
}



export default new Vuex.Store({
  // 保存状态
  state: {
    counter:1000,
    students:[
      {id:110,name:'lizhi',age:18},
      {id:111,name:'theshy',age:22},
      {id:112,name:'zouxinxin',age:38},
    ],
    info:{
      name:"caixukun",
      hobbis:['rap','basketball'],
      age:22
    }
  },
  // mutation 转变
  mutations: {
    // 方法 默认参数state
    [INCREMENT](state){
      state.counter++
    },
    decreament(state){
      state.counter--
    },
    increCount(state,payload){
      console.log(payload);
      
      state.counter += payload.count
    },
    addStudent(state,student){
      state.students.push(student)
    },
    updateInfo(state) {
      Vue.set(state.info,'address','beijing') //添加属性
      Vue.delete(state.info,'age') //删除属性
       // 错误的代码，不能在这里进行异步操作
      // setTimeout(()=>{
        // state.info.name = Sutter
      // },1000)
      state.info.name="Sutter"
    },
  },
  actions: {
    // context上下文编程翻译
    // aUpdateInfo(context,payload){
    //   setTimeout(()=>{
    //     context.commit('updateInfo')
    //     // console.log(payload);
    //     console.log(payload.param);
    //     payload.successed()       
    //   },1000)
    // },
    aUpdateInfo(context,payload){
     return  new Promise((resolve,reject)=>{
       setTimeout(()=>{
         context.commit('updateInfo')
         console.log(payload);
         resolve("action.params")   
       },1000)
     })
    }
  },
  getters: {
    powerCounter(state){
      return state.counter*state.counter
    },
    moreTwenty(state,getters){
      return state.students.filter(s =>{
        return s.age>getters.moreAge
      })
    },
    moreTwentyLen(state,getters){
      return getters.moreTwenty.length
    },
    moreAge(state){
    //   return function(age){
    //     return state.students.filter(s =>{
    //       return s.age>age
    //     })
    //   }

    return age =>{
      return state.students.filter(s => s.age >age)
    }
    }
  },
  modules: {
    a: moduluA
  }
})

HelloWorld.vue

<template>
  <div class="hello">

    <h2>module中内容</h2>
    <h2>{{$store.state.a.name}}</h2>
    <button @click="updateName('paul')">修改名字</button>
    <h2>{{$store.getters.fullname}}</h2>
     <h2>{{$store.getters.fullName}}</h2>
     <h2>{{$store.getters.newFullname}}</h2>
     <button @click="asyncName()">异步修改</button>
    <h2>---------------------------------</h2>
     
      
    <h2>{{$store.state.counter}}</h2>
    <button @click="add()">+</button>
    <button @click="reduce()">-</button>
    <button @click="addCount(5)">+5</button>
    <button @click="addStu({id:111,name:'123',age:12})">添加学生</button>

    <h2>-------------------------------------</h2>
    <h2>{{$store.getters.powerCounter}}</h2>

    <h2>--------------</h2>
    <h2>{{$store.getters.moreTwentyLen}}</h2>

    <h2>---------------</h2>
    <h2>{{$store.state.info}}</h2>
    <button @click="updateInfo">添加信息</button>
  </div>
</template>

<script>
import {
  INCREMENT
} from '../store/mutations-types'

export default {
  name: 'HelloWorld',
  props: {
    msg: String
  },
  // computed:{
  //   moreTwenty(){
  //     return this.$store.state.students.filter(s =>{
  //       return s.age>20
  //     })
  //   }
  // },
  methods: {
    add(){
      // 拿到store对象进行提交commit
      console.log(INCREMENT);
      
      this.$store.commit(INCREMENT)
    },
    reduce(){
      this.$store.commit('decreament')
    },
    addCount(num){
      // payload 负载
      // 普通的提交风格
      // this.$store.commit('increCount',num)

      // 特殊的提交风格
      this.$store.commit({
        type:'increCount',//事件类型.
        count:num

      })
    },
    addStu(student){
      this.$store.commit('addStudent',student)
    },
    // updateInfo(){
    // //  this.$store.commit('updateInfo')
    // this.$store.dispatch('aUpdateInfo',{
    //     param:"我是参数",
    //     successed(){
    //       console.log("传入成功");
          
    //     }
      
    // })
    // }
     updateInfo(){
    //  this.$store.commit('updateInfo')
    this.$store
    .dispatch('aUpdateInfo','携带的params')
    .then(res=>{
      console.log("里面完成了回调");
      
      console.log(res);
      
    })
    },
    updateName(param){
      this.$store.commit('updateName',param)
    },
    asyncName(){
      this.$store.dispatch('aUpdateName')
    }
  },

}
</script>

<style scoped>

</style>

App.vue

<template>
  <div id="app">
   <h2>{{$store.state.counter}}</h2>
   <h2>{{$store.getters.moreAge(0)}}</h2>
   <!-- <h2>{{$store.getters.moreAge(10)}}</h2> -->
   <h2>---------------------------------</h2>
   <HelloWorld></HelloWorld>
  
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld' 

export default {
  name:"app",
  components:{
    HelloWorld
  }
}
</script>

<style>
</style>

mutations-types.js

export const INCREMENT = 'increment'

更多同步vue学习代码或者观看vue全家桶学习笔记请点击这里的，麻烦帮忙点个star