import axios from 'axios';import { Message, Loading } from 'element-ui';import Cookies from 'js-cookie';import router from '@/router/index'let loading  //定義loading變量function startLoading() { //使用Element loading-start 方法 loading = Loading.service({  lock: true,  text: '加載中……',  background: 'rgba(0, 0, 0, 0.7)' })}function endLoading() { //使用Element loading-close 方法 loading.close()}//那么 showFullScreenLoading() tryHideFullScreenLoading() 要干的事兒就是將同一時刻的請求合并。//聲明一個變量 needLoadingRequestCount，每次調用showFullScreenLoading方法 needLoadingRequestCount + 1。//調用tryHideFullScreenLoading()方法，needLoadingRequestCount - 1。needLoadingRequestCount為 0 時，結束 loading。let needLoadingRequestCount = 0export function showFullScreenLoading() { if (needLoadingRequestCount === 0) {  startLoading() } needLoadingRequestCount++}export function tryHideFullScreenLoading() { if (needLoadingRequestCount <= 0) return needLoadingRequestCount-- if (needLoadingRequestCount === 0) {  endLoading() }}//http request 攔截器axios.interceptors.request.use( config => {  var token = ''  if(typeof Cookies.get('user') === 'undefined'){   //此時為空  }else {   token = JSON.parse(Cookies.get('user')).token  }//注意使用的時候需要引入cookie方法，推薦js-cookie  config.data = JSON.stringify(config.data);  config.headers = {   'Content-Type':'application/json'  }  if(token != ''){   config.headers.token = token;  }  showFullScreenLoading()  return config; }, error => {  return Promise.reject(err); });//http response 攔截器axios.interceptors.response.use( response => {  //當返回信息為未登錄或者登錄失效的時候重定向為登錄頁面  if(response.data.code == 'W_100004' || response.data.message == '用戶未登錄或登錄超時，請登錄！'){   router.push({    path:"/",    querry:{redirect:router.currentRoute.fullPath}//從哪個頁面跳轉   })  }  tryHideFullScreenLoading()  return response; }, error => {  return Promise.reject(error) })