Vuex中状态管理器的使用详解

const state = {
xxx: initValue
}

const mutations = {
xxx(state, {data1}) {
// 更新 state 的某个属性
}
}

const actions ={
zzz ({commit, state}, data1){
commit('xxx', {data1})
}
}

const getters ={
xxx(state) {
return ...
}
}

import { createStore} from "vuex";
export default createStore({
    //vuex中的数据源,我们需要保存的数据就保存在这里，可以在组件通过 this.$store.state来获取我们定义的数据；
    state: {
        count: 0,
        age: 0
    },
    
    getters: {
        getterAge(state){
            return state.age =25
        }
    },
    
    mutations: {
        addCount(state,obj){
            return state.count += obj.num
        },
        subCount(state,obj){
            return state.count -= obj.num
        }
    },
    actions: {
        addCountAsyn(context){
            setTimeout(()=>{
                context.commit('addCount',{
                    num: 1
                })
            },3000)
        },
        subCountAsyn(context){
            setTimeout(()=> {
                context.commit('subCount',{
                    num: 1
                })
            },2000)
        }
    }
})

<template>
  <div>
    <h2>通过getter获得计算后的年龄：{{ getterAge }}</h2>
    <p>Count：{{ count }}</p>
    <button @click="handlerAdd()">加1</button>
    <button @click="handlerSub()">减1</button>
    <button @click="handlerAddAnys()">异步增加(2s后执行)</button>
    <button @click="handlerSubAnys()">异步减少(2s后执行)</button>
  </div>
</template>
 
<script>
export default {
  name: "Home",
  computed: {
    count(){
      return this.$store.state.count
    },
    getterAge(){
      return this.$store.getters.getterAge
    }
   },
  methods: {
    handlerAdd(){
      this.$store.commit("addCount",{
        num: 1
      })
    },
    handlerSub(){
      this.$store.commit("subCount",{
        num: 1
      })
    },
    handlerAddAnys(){
      this.$store.dispatch('addCountAsyn')
    },
    handlerSubAnys(){
      this.$store.dispatch('subCountAsyn')
    }
   }
}
</script>

count(){
     return this.$store.state.count
},

...mapState([
  'count'
]),

getterAge(){
  return this.$store.getters.getterAge
}

...mapGetters(['getterAge'])    

handlerAdd(){
  this.$store.commit("addCount",{
    num: 1
  })
},
handlerSub(){
  this.$store.commit("subCount",{
    num: 1
  })
},

...mapMutations({
  handlerAdd: 'addCount',
  handlerSub: 'subCount'
})

handlerAddAnys(){
  this.$store.dispatch('addCountAsyn')
},
handlerSubAnys(){
  this.$store.dispatch('subCountAsyn')
}

...mapActions({
  handlerAddAnys: 'addCountAsyn',
  handlerSubAnys: 'subCountAsyn'
})