text: import Vue from 'vue'
  import Vuex from 'vuex'
  
  Vue.use(Vuex)
  
  export default new Vuex.Store({
    state:{
      city:'上海',
      index:0
    },
    actions:{
      change(ctx,city){
        ctx.commit('change',city)
      }
    },
    mutations:{
      change(state,city){
        state.city = city
      }
    }
  })
  
  