How to use the state object of vuex

This article introduces you to 5 ways to use the state object of vuex, and posts the structure of my vuex to you. Friends who are interested can follow the editor of Script Home to learn together

vuex It is a state management mode specially designed for vue.js, and can also be debugged using devtools.

The following is the structure of my vuex.

The following is the content of state.js and index.js under the store folder

//state.js
const state = {
 headerBgOpacity:0,
 loginStatus:0,
 count:66
}
export default state
//index.js
import Vue from 'vue'
import Vuex from 'vuex'
import state from './state'
import actions from './actions'
import getters from './getters'
import mutations from './mutations'
Vue.use(Vuex)
export default new Vuex.Store({
 state,
 actions,
 getters,
 mutations
})

Let’s start using the vuex state object in the test.vue component

Method 1

<template>
 <p class="test">
  {{$store.state.count}} <!--第一种方式-->
 </p>
</template>
<script type="text/ecmascript-6">
 export default{
  name:&#39;test&#39;,
  data(){
   return{ }
  }
 }
</script>
<style>
</style>

Method Two

<template>
 <p class="test">
  {{count}} <!--步骤二-->
 </p>
</template>
<script type="text/ecmascript-6">
 export default{
  name:&#39;test&#39;,
  data(){
   return{}
  },
  computed:{
   count(){
    return this.$store.state.count; //步骤一
   }
  }
 }
</script>
<style>
</style>

Method Three

<template>
 <p class="test">
  {{count}} <!--步骤三-->
 </p>
</template>
<script type="text/ecmascript-6">
 import {mapState} from &#39;vuex&#39; //步骤一
 export default{
  name:&#39;test&#39;,
  data(){
   return{}
  },
  computed:mapState({     //步骤二,对象方式
   count:state => state.count
  })
 }
</script>
<style>
</style>

Method 4

<template>
 <p class="test">
  {{count}} <!--步骤三-->
 </p>
</template>
<script type="text/ecmascript-6">
 import {mapState} from &#39;vuex&#39; //步骤一
 export default{
  name:&#39;test&#39;,
  data(){
   return{}
  },
  computed:mapState([    //步骤二,数组方式
   "count"
  ])
 }
</script>
<style>
</style>

Method five

<template>
 <p class="test">
  {{count}} <!--步骤三-->
 </p>
</template>
<script type="text/ecmascript-6">
 import {mapState} from &#39;vuex&#39; //步骤一
 export default{
  name:&#39;test&#39;,
  data(){
   return{}
  },
  computed:{
   ...mapState([       //步骤二，三个点方式
    "count"
   ])
  }
 }
</script>
<style>
</style>

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