async handler() {
  this.loading = true
  await fetch()
  this.loading = false
}

import { loadingState, loadingMutations } from 'vue-ajax-loading'

const store = new Vuex.Store({
  state: {
    ...loadingState
  },
  mutations: {
    ...loadingMutations
  }
})

import { ajaxLoading } from 'vue-ajax-loading'
import axios from 'axios'
import store from '../store' // Vuex.Store 创建的实例
axios.defaults.baseURL = 'https://cnodejs.org/api/v1'
// 把请求集中到单一对象上，如：
const service = {
  global: {
    // 全局的请求
    getTopics() {
      return axios.get('/topics')
    },
    getTopicById(id = '5433d5e4e737cbe96dcef312') {
      return axios.get(`/topic/${id}`)
    }
  },
  modules: {
    // 有命名空间的请求，命名空间就是 topic
    topic: {
      getTopics() {
        return axios.get('/topics')
      },
      getTopicById(id = '5433d5e4e737cbe96dcef312') {
        return axios.get(`/topic/${id}`)
      }
    }
  }
}

export default ajaxLoading({
  store,
  service
})

<el-button type="primary" :loading="$loading.getTopics" @click="handler1">getTopics</el-button>
<el-button type="primary" :loading="$loading.delay" @click="delay">定时两秒</el-button>
<el-button type="primary" :loading="$loading.topic.getTopics" @click="handler3">topic.getTopics</el-button>

import api from 'path/to/api'
export default {
  methods: {
    handler1() {
      api.getTopics()
    },
    handler3() {
      api.topic.getTopics()
    },
    delay() {
      api.delay()
    }
  }
}