jichuangshe/mini/store/modules/tab.js

import Cache from '@/utils/cache'
import Constant from '@/utils/constant'
const val = Cache.get(Constant.CACHE_TAB_SELECTED)
const getDefaultState = () => {
  return {
    index: val === undefined ? 1 : val
  }
}

const state = getDefaultState()

const mutations = {
  SET_INDEX: (state, index) => {
    Cache.set(Constant.CACHE_TAB_SELECTED, index)
    state.index = index
  }
}

const actions = {
  index({ commit }, index) {
    commit('SET_INDEX', index)
  }
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}