解读vue页面监听store值改变问题

import router, { rootRoute, exceptionRoutes, filterAsyncRoutes } from '@/routes'
import asyncRoutes from '@/routes/asyncRoutes'
import config from '@/utils/config'
import { length } from '@/utils'
import request from '@/api'
 
export default {
  namespaced: true,
  state: {
    messageList:[],//消息列表
  },
  mutations: {
    //聊天消息储存
    SET_MESSAGELIST:(state, info)=>{
      let data = Object.assign([], state.messageList ,info)
      state.messageList = data
    },
  },
  actions: {
    
    },
    // 同步缓存页面
    AsyncIncludes ({ commit, state }, data) {
      commit('SET_INCLUDES', data)
    },
    // 新增缓存页面
    AddIncludes ({ commit, state }, path) {
      let includes = state.includes
      if (includes.indexOf(path) < 0) {
        includes.push(path)
      }
      commit('SET_INCLUDES', includes)
    },
    // 删除缓存页面
    DelIncludes ({ commit, state }, path) {
      let includes = state.includes.filter(i => i !== path)
      commit('SET_INCLUDES', includes)
    },
    // 退出
    Logout ({ commit }) {
      commit('SET_OUT')
    }
  },
  getters: {
    includes: state => state.includes,
    get_CustomerList: state => state.customerList,
    get_ExpertList: state => state.expertList,
  }
}

SET_MESSAGELIST:(state, info)=>{
      let data = Object.assign([], state.messageList ,info)
      state.messageList = data
    }

hat.$store.commit('permission/SET_MESSAGELIST', that.conversationList)

 computed: {
 
        cuserList() {
 
            return this.$store.state.permission.messageList;
 
        },
 
    },

watch:{     //监听value的变化，进行相应的操做便可
    fuid: function(a,b){     //a是value的新值，b是旧值
      this.uid = this.fuid;
      this.chatList =[]
      this.getChatList();
    },
    cuserList: {
        handler(nval, oval) {
          debugger
          if(nval.length>0){
              this.userList.forEach(item=>{
                nval.forEach(item2=>{
                  if(item.uid==item2.send_uid && this.uid ==item2.receive_uid){
                   item.unreadCount = item.unreadCount+1;
                   item.msg_type = item2.msg_type;
                   item.msg_content = item2.msg_content;
                  }
                  if(item.uid==item2.send_uid && this.uid ==item2.receive_uid){
                   item.unreadCount = item.unreadCount+1;
                   item.msg_type = item2.msg_type;
                   item.msg_content = item2.msg_content;
                  }
                })
              })
              console.log(this.userList)
          }
        },
        deep: true, // 深度监听
        immediate: true,//立即执行
    },
  },

// state.js
noticeParams: [
    { CODE: null, NoticeType: null},
    { CODE: null, NoticeType: null},
    { CODE: null, NoticeType: null}
  ]
// 所引用组件
export default {
  methods: {
    profileJump(path, tab) {
      this.$router.push({ path: path, query: { tab: tab } });
    }
  },
  computed: {
    ...mapState(['noticeParams'])
  },
  watch: {
    noticeParams(val){
      console.log('HomeHeader=====>', val);
    }
  }
};

// 重新赋值
computed: {
    ...mapState(['noticeParams'])
  },
methods:{
    fn(){
        // 省略了一些操作
        this.$store.commit('setNoticeParams', this.noticeParams)
    }
}

 // mutations里的方法
 setNoticeParams(state, data) {
     // 问题就出现在此处
    state.noticeParams = data
  }

setNoticeParams(state, data) {
    let arr = Object.assign([], state.noticeParams, data);
    state.noticeParams = arr
    // 创建一个空数组，将初始state.noticeParams与改变后的state.noticeParams==》data合并，最后赋值给state.noticeParams
  }