vuex映射值时出错Computed property "city" was assigned to but it has no setter

来源：8-12 Vue项目城市选择页 - 使用keep-alive优化网页性能

YananNi

2018-05-28

import HomeHeader from './components/header'
import HomeSwiper from './components/swiper'
import HomeIcons from './components/icons'
import HomeRecomment from './components/recomment'
import HomeGo from './components/go'
import Axios from 'axios'
import { mapState } from 'vuex'
export default {
 name:"Home",
 components:{HomeHeader,HomeSwiper,HomeIcons,HomeRecomment,HomeGo},
 data (){
  return {
   swiperList:[],
   iconList:[],
   recommendList:[],
   weekendList:[]
  }
 },
 computed: {
  ...mapState(['city'])
 },
 methods:{
  ajaxIndex () {
   Axios.get('/api/index.json?city=' + this.city).then(this.respones)
  },
  respones (res) {
   console.log(res);
   const list=res.data.data;
   this.city=list.city
   this.swiperList=list.swiperList
   this.iconList=list.iconList
   this.recommendList=list.recommendList
   this.weekendList=list.weekendList
  }
 },
 mounted () {
  this.lostcity = this.city
  this.ajaxIndex()
 },
 activated () {
  if (this.lostcity !== this.city) {
   this.lostcity = this.city
   this.ajaxIndex()
  }
 }
}

报错：Computed property "city" was assigned to but it has no setter.

程序正常运行

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