封装token

 let baseApiUrl = 'xxxx'
 var app = getApp();

 let defaultHeaders = {
     'Content-Type': 'application/json'
 }
 function request(url, data, method, header={}) {
   return new Promise(function (reslove, reject) {
     wx.request({
       url: baseApiUrl + url,
       data: data,
       method: method,
       header: Object.assign(defaultHeaders, header,{
         token: wx.getStorageSync('_user_token')
       }),
       success: function (res) {
         if (res.statusCode != 200) {
           reject(res);
           return
         } else if (res.data.code == 10020001){
           console.log('invalida token.')
           refreshToken().then(resp=>{
             console.log('request aggin...')
             request(url, data, method, header).then((resp) => {
               reslove(resp)
             })
           })
           return
         }
         reslove(res);
       },
       fail: function (res) {
         reject(res);
       },
       complete: function (res) {
       }
     })
   })
 }

 function refreshToken(){
   return new Promise((resolve, reject) => {
     wx.login({
       success(res) {
         console.log(res)
         request('/login/index/index', {
           code: res.code
         }).then(res => {
           var _user_token = res.data.data.token
           var _user_openid = res.data.data.openid
           var _user_unionId = res.data.data.unionid
           var token_time = Date.parse(new Date()) + 23 * 60 * 60 * 60
           wx.setStorageSync('_user_token', _user_token);
           wx.setStorageSync('token_time', token_time);
           wx.setStorageSync('_user_openid', _user_openid);
           wx.setStorageSync('_user_unionId', _user_unionId);
           defaultHeaders.token = res.data.token
           resolve(res.data)
         })
       },
       fail(res) {
         reject()
       }
     })
   })
 }

 module.exports = {
   refreshToken: refreshToken,
   request: request
 }