vuex state中的数组变化监听实例

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

Vue.use(Vuex)

const state = {
 messArray:[]
}

const mutations = {
 modifyArray(state, obj){
 state.messArray=obj.messArray
 // Vue.$set(this,this.messArray,[...obj.messArray])
}

const actions={
 modifyArr(context,obj){
 context.mit('modifyArray',obj)
 },
}
export default new Vuex.Store({
 state,
 mutations,
 actions
})

//在使用事前必须引入这个
import { mapState, mapGetters, mapMutations, mapActions } from 'vuex'

data() {
  return {
  ...mapState(["messArray"]),
  }
 }

watch:{
  messArray: function(val){
  console.log("watch ChildA.vue "+val)
  }
}

const getters = {
 messArray_get:state=>state.messArray,
}

 ...mapGetters(['messArray_get']),

 watch:{

  messArray_get : function(val){
   console.log("messArray_get "+val)
  }

 }