//app.js
App({
  
    userLogin:function()
    {
      var that = this;
      //定义promise方法
      return new Promise(function (resolve, reject) 
        {
        // that.getUserLocation(that,null);
        /*获取当前用户的地理位置 */
        wx.login({
          success(res) {
            if (res.code) {
              //发起网络请求
              wx.request({
                url: ‘***/index/zzcxe/getuserinfo‘,
                data: {
                  code: res.code
                },
                success: res => {
                  console.log(res.data);
                  if (res.data.openid) {
                    wx.setStorageSync(‘open_id‘, res.data.openid);
                   /*session_key为服务器通过code及其它组合成生的一个token*/
                    wx.setStorageSync(‘session_key‘, res.data.session_key);
                  }
                }
              })
            } else {
              console.log(‘登录失败！‘ + res.errMsg)
            }
            resolve(res);
          },fail:function()
          {
            reject();
          }
        });
      });

    },

//获取应用实例
const app = getApp();

onLoad: function () {
   var that=this;
   app.userLogin().then(res=>{console.log(‘sucess‘);});

wx.request({
    url: webUrl + model.url,
    data: model.param,
    header: {
      "Content-Type": "application/json",
      "token": wx.getStorageSync(‘session_key‘)
    },