Vuex-＞vuex获取值以及改变值，vuex异步请求

vuex获取值以及改变值
vuex异步请求

1.vuex获取值以及改变值

Vuex分成五个部分：

   1.State：单一状态树

   2.Getters：状态获取

   3.Mutations：触发同步事件

   4.Actions：提交mutation，可以包含异步操作

   5.Module：将vuex进行分模块

Vuex安装

npm install vuex -S

npm i -S vuex@3.6.2

Vuex使用

//src/views/vux/page2
<template>
  <h1>第二个页面</h1>
  {{msg}}
</template>

<script>
  export default {
    data() {
      return {
        msg:'默认值'
      }
    }
  }
</script>

<style>
</style>

//src/views/vuex/page1
<template>
  <h1>第一个页面</h1>
  {{msg}}
</template>

<script>
  export default {
    data() {
      return {
        msg:'默认值'
      }
    }
  }
</script>

<style>
</style>

//src/router/index.js
import Vue from 'vue'
import Router from 'vue-router'
import HelloWorld from '@/components/HelloWorld'
import AppMain from '@/components/AppMain'
import LeftNav from '@/components/LeftNav'
import TopNav from '@/components/TopNav'
import Login from '@/views/Login'
import Register from '@/views/Register'
import AddBook from '@/views/book/AddBook'
import BookList from '@/views/book/BookList'
import page1 from '@/views/vuex/page1'
import page2 from '@/views/vuex/page2'
Vue.use(Router)

export default new Router({
  routes: [{
      path: '/',
      name: 'Login',
      component: Login
    },
    {
      path: '/Register',
      name: 'Register',
      component: Register
    },
    {
      path: '/AppMain',
      name: 'AppMain',
      component: AppMain,
      children: [{
          path: '/LeftNav',
          name: 'LeftNav',
          component: LeftNav
        },
        {
          path: '/TopNav',
          name: 'TopNav',
          component: TopNav
        },
        {
          path: '/book/AddBook',
          name: 'AddBook',
          component: AddBook
        },
        {
          path: '/book/BookList',
          name: 'BookList',
          component: BookList
        },
        {
          path: '/vuex/page1',
          name: 'page1',
          component: page1
        },
        {
          path: '/vuex/page2',
          name: 'page2',
          component: page2
        }]
    }
  ]

})

//src/components/LeftNav.vue
<template>
  <el-menu router :default-active="$route.path" default-active="2" class="el-menu-vertical-demo"
    background-color="#334157" text-color="#fff" active-text-color="#ffd04b" :collapse="collapsed">
    <!-- <el-menu default-active="2" :collapse="collapsed" collapse-transition router :default-active="$route.path" unique-opened class="el-menu-vertical-demo" background-color="#334157" text-color="#fff" active-text-color="#ffd04b"> -->
    <div class="logobox">
      <img class="logoimg" src="../assets/img/logo.png" alt="">
    </div>
<!-- 写死的数据 -->
    <el-submenu index="idx_999" key="key_999">
      <template slot="title">
        <span>vuex管理</span>
      </template>
      <el-menu-item index="/vuex/page1" key="key_99901">
        <span>页面一</span>
      </el-menu-item>
      <el-menu-item index="/vuex/page2" key="key_99902">
        <span>页面二</span>
      </el-menu-item>
    </el-submenu>
<!-- 加载数据库,得到的数据 -->
    <el-submenu v-for="m in menus" :index="'idx_'+m.id" :key="'key_'+m.id">
      <template slot="title">
        <i :class="m.icon"></i>
        <span>{{m.text}}</span>
      </template>
      <el-menu-item v-for="m2 in m.modules" :index="m2.url" :key="'key_'+m2.id">
        <i :class="m2.icon"></i>
        <span>{{m2.text}}</span>
        <span></span>
      </el-menu-item>
    </el-submenu>
    <!-- <el-submenu index="1">
      <template slot="title">
        <i class="el-icon-location"></i>
        <span>导航一</span>
      </template>
      <el-menu-item-group>
        <template slot="title">分组一</template>
        <el-menu-item index="1-1">选项1</el-menu-item>
        <el-menu-item index="1-2">选项2</el-menu-item>
      </el-menu-item-group>
      <el-menu-item-group title="分组2">
        <el-menu-item index="1-3">选项3</el-menu-item>
      </el-menu-item-group>
      <el-submenu index="1-4">
        <template slot="title">选项4</template>
        <el-menu-item index="1-4-1">选项1</el-menu-item>
      </el-submenu>
    </el-submenu>
    <el-menu-item index="2">
      <i class="el-icon-menu"></i>
      <span slot="title">导航二</span>
    </el-menu-item>
    <el-menu-item index="3" disabled>
      <i class="el-icon-document"></i>
      <span slot="title">导航三</span>
    </el-menu-item>
    <el-menu-item index="4">
      <i class="el-icon-setting"></i>
      <span slot="title">导航四</span>
    </el-menu-item>-->
  </el-menu>
</template>
<script>
  export default {
    data() {
      return {
        collapsed: false,
        menus: []
      }
    },
    created() {
      this.$root.Bus.$on('aaa', v => {
        this.collapsed = v;
      });
      let url = this.axios.urls.SYSTEM_MENUS;
      this.axios.get(url, {}).then(r => {
        console.log(r);
        this.menus = r.data.rows;
      }).catch(e => {

      })
    }
  }
</script>
<style>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 240px;
    min-height: 400px;
  }

  .el-menu-vertical-demo:not(.el-menu--collapse) {
    border: none;
    text-align: left;
  }

  .el-menu-item-group__title {
    padding: 0px;
  }

  .el-menu-bg {
    background-color: #1f2d3d !important;
  }

  .el-menu {
    border: none;
  }

  .logobox {
    height: 40px;
    line-height: 40px;
    color: #9d9d9d;
    font-size: 20px;
    text-align: center;
    padding: 20px 0px;
  }

  .logoimg {
    height: 40px;
  }
</style>

vuex获取值以及改变值

结构

//src/store/state.js
export default{
  eduName:'卓京教育',
  aname:'',
  bname:''
}

//src/store/mutations.js
export default{
  setEduName:(state,payload) => {
    // state指的就是state.js文件导出的对象
    //payload就是vue文件传递过来的参数
    // A.vue name  {a_name:this.name}
    // B.vue name  {b_name:this.name}
    // state.aname=payload.a_name;
    // state.bname=payload.b_name;
    state.eduName=payload.eduName
      }
}

//src/store/getters.js
export default{
  getEduName:(state) => {
    return state.eduName;
      }
}

//src/store/index.js
import Vue from 'vue'
import Vuex from 'vuex'
import state from './state'
import getters from './getters'
import actions from './actions'
import mutations from './mutations'
Vue.use(Vuex)
const store = new Vuex.Store({
 	state,
 	getters,
 	actions,
 	mutations
 })

 export default store

//src/main.js
// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from 'vue'
//开发环境：true && require('@/mock')
//生产环境：false && require('@/mock')
//开发环境下才会引入mockjs
// process.env.MOCK && require('@/mock')
// 新添加1
import ElementUI from 'element-ui'
// 新添加2，避免后期打包样式不同，要放在import App from './App';之前
import 'element-ui/lib/theme-chalk/index.css'

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

import axios from '@/api/http'
import VueAxios from 'vue-axios'

Vue.use(VueAxios,axios)
// 新添加3
Vue.use(ElementUI);
Vue.config.productionTip = false
/* eslint-disable no-new */


new Vue({
  el: '#app',
  router,
  store,
  data(){
    return{
       Bus:new Vue()
    }
  },
  components: { App },
  template: '<App/>'
})

//src/views/vuex/page1.vue
<template>
  <div style="padding:60px;">
    <h1>第一个页面</h1>
    <p>改变state中的值</p>
    请输入学校名称：<input v-model="msg">
    <button @click="fun1">获取state</button>
    <button @click="fun2">改变state</button>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        msg: '默认值'
      }
    },
    methods:{
      fun1(){
        // this.$store-->store/index.js  不推荐
        let eduName=this.$store.state.eduName;
        alert(eduName);
      },
      fun2(){
        this.$store.commit('setEduName',{
          eduName:this.msg
        })
      }
    }
  }
</script>

<style>
</style>

//src/views/vuex/page2.vue
<template>
  <div>
    <h1>第二个页面</h1>
    {{eduName}}
  </div>
</template>

<script>
  export default {
    data() {
      return {
        msg: '默认值'
      }
    },
    computed:{
      eduName(){
        // return this.$store.state.eduName;  //第一种
        return this.$store.getters.getEduName;  //第二种
      }
    }
  }
</script>

<style>
</style>

2.vuex异步请求

同步：某一个时间点只做一件事情，只有当这件事做完，才做另一件事

异步：某一个时间点，可以做许多事情

//src/api/action.js 
 /**
   * 对后台请求的地址的封装，URL格式如下：
   * 模块名_实体名_操作
   */
  export default {
    'SERVER': 'http://localhost:8080/ssm', //服务器
    'SYSTEM_USER_DOLOGIN': '/user/userLogin', //登陆
    'SYSTEM_USER_DOREG': '/user/userRegister', //注册
    'SYSTEM_MENUS': '/module/queryRootNode', //左侧菜单树
    'BOOK_LIST': '/book/queryBookPager', //书籍列表
    'BOOK_ADD': '/book/addBook', //书籍增加
    'BOOK_UPD': '/book/editBook', //书籍修改
    'BOOK_DEL': '/book/delBook', //书籍删除
    'VUEX_AJAX': '/vuex/queryVuex', //vuex后台异步请求
    'getFullPath': k => { //获得请求的完整地址，用于mockjs测试时使用
      return this.SERVER + this[k];
    }
  }

//src/store/actions.js
export default {
  setEduNameAsync: (context, payload) => {
    // context指的是vuex的上下文
    setTimeout(function() {
      context.commit('setEduName', payload);
    }, 15000);
  },
  setEduNameAjax: (context, payload) => {
    //this并不代表vue实例
    let _this=payload._this;
    let url=_this.axios.urls.VUEX_AJAX;
    let params={
      resturantName:payload.eduName
    }
    _this.axios.post(url, params).then(r => {
      console.log(r)
    }).catch(e => {
      console.log(e);
    });
  }
}

//src/views/vuex/page1
<template>
  <div style="padding:60px;">
    <h1>第一个页面</h1>
    <p>改变state中的值</p>
    请输入学校名称：<input v-model="msg">
    <button @click="fun1">获取state</button>
    <button @click="fun2">改变state</button>
    <button @click="fun3">改变state</button>
    <button @click="fun4">请求后台</button>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        msg: '默认值'
      }
    },
    methods: {
      fun1() {
        // this.$store-->store/index.js  不推荐
        let eduName = this.$store.state.eduName;
        alert(eduName);
      },
      fun2() {
        this.$store.commit('setEduName', {
          eduName: this.msg
        })
      },
      fun3() {
        this.$store.dispatch('setEduNameAsync', {
          eduName: this.msg
        })
      },
      fun4() {
        this.$store.dispatch('setEduNameAjax', {
          eduName: this.msg,
          _this:this
        })
      }
    }
  }
</script>

<style>
</style>