request.js完整代码：

// 引入网络请求库 https://github.com/axios/axios

import axios from 'axios'
import store from '../store'
import router from '../router'

// axios.defaults.timeout = 10000
const requestList = []

axios.defaults.headers.post['Content-Type'] = 'application/json;charset=UTF-8'

axios.defaults.baseURL = process.env.BASE_URL
// 自定义拦截器
axios.interceptors.request.use((config) => {
  requestList.push(config.url)
  store.dispatch('changeGlobalState', {loading: true})
  const token = store.getters.userInfo.token
  if (token) {
    config.headers.token = token
  }
  return config
}, function (error) {
  return Promise.reject(error)
})

axios.interceptors.response.use(function (response) {
  requestList.splice(requestList.findIndex(item => item === response.config.url), 1)
  if (requestList.length === 0) {
    store.dispatch('changeGlobalState', {loading: false})
  }
  if (response.data.code === 900401) {
    window.$toast.error('认证失效，请重新登录！', 1000)
    router.push('/login')
  }
  return response
}, function (error) {
  requestList.length = 0
  store.dispatch('changeGlobalState', {loading: false})
  if (axios.isCancel(error)) {
    throw new axios.Cancel('cancel request')
  } else {
    window.$toast.error('网络请求失败！', 1000)
  }
  return Promise.reject(error)
})

const CancelToken = axios.CancelToken
let sources = []

const request = function (url, params, config, method) {
  return new Promise((resolve, reject) => {
    axios[method](url, params, Object.assign(config, {
      cancelToken: new CancelToken(function executor (c) {
        sources.push(c)
      })
    })).then(response => {
      resolve(response.data)
    }, err => {
      reject(err)
    }).catch(err => {
      reject(err)
    })
  })
}

const post = (url, params, config = {}) => {
  return request(url, params, config, 'post')
}

const get = (url, params, config = {}) => {
  return request(url, params, config, 'get')
}

export {sources, post, get}
以上。
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关键词：axios是啥？axios基于业务场景的二次封装详细说明（示例）