微信小程序里解决app.js onLaunch事件与小程序页面的onLoad加载前后异常问题

使用 Promise 解决小程序页面因为需要app.js onLaunch 参数导致的请求失败

app.js onLaunch 的代码

 "use strict";
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
 const http = require('./utils/http.js');
 const api = require('./config.js');
 const updateManager = wx.getUpdateManager();

 App({
   onLaunch: function() {
     updateManager.onCheckForUpdate(function(res) {
       // 请求完新版本信息的回调
       console.log('请求完新版本信息的回调');
       console.log(res.hasUpdate)
     })

     updateManager.onUpdateReady(function() {
       wx.showModal({
         title: '更新提示',
         content: '新版本已经准备好，是否重启应用？',
         success(res) {
           if (res.confirm) {
             // 新的版本已经下载好，调用 applyUpdate 应用新版本并重启
             updateManager.applyUpdate()
           }
         }
       })
     })

     updateManager.onUpdateFailed(function() {
       // 新版本下载失败
       wx.showModal({
         title: '提示',
         content: '新版本下载失败',
         showCancel: false
       })
     })
     var _this = this;
     _this.GetSystemInfo();
     // _this.toLogin();

   },
   globalData: {
     screenWidth: 0, //屏幕宽度
     screenHeight: 0, //屏幕高度
     fontSize: 14, //字体大小
     openid: '',
     phone: '',
     shopid: '', //没有openid 退出
     logined: false, //是否已经获取了手机号
     nickname: '', //昵称
     photo: '', //头像
     editJobStorageKey: 'edit-job-storage', //编辑职能（角色）的缓存
     isbindrole: false, //是否已经绑定了职能（角色）
     rolenumber: '', //职能编号
     rolename: '', //职能名称
     shopname: '',
     func_modular: '', //功能模块权限
     branchListStorageKey: 'branch-list-storage', //门店列表
     branchCityListStorageKey: 'branch-city-list-storage', //门店城市列表
     auth_num: 0, //可授权使用人数
     productname: '', //线下产品名称
     adminid: 0, //管理员或者店员的id
   },
   GetSystemInfo: function() {
     var _this = this;
     const info = wx.getSystemInfoSync();
     _this.globalData.screenWidth = info.screenWidth;
     _this.globalData.screenHeight = info.screenHeight;
     _this.globalData.fontSize = info.fontSizeSetting;
   },

   //首次登录  不存在shopid
   toLogin: function() {
     console.log('启动页');
     var _this = this;
     return new Promise(function(resolve, reject) {
       wx.login({
         success: function(res) {
           var code = res.code;
           console.log(res);
           var postData = {
             code: code,
             shopid: _this.globalData.shopid
           };
           wx.showLoading({
             title: '登录中...',
           })
           http.httpPost(api.Login, postData, function(result) {
             console.log(result);
             wx.hideLoading();
             if (result.success) {
               if (result.result.success) {
                 _this.globalData.openid = result.result.data.openid;
                 if (result.result.data.phone) {
                   _this.globalData.phone = result.result.data.phone;
                 }
                 if (result.result.data.photo) {
                   _this.globalData.photo = result.result.data.photo;
                 }
                 if (result.result.data.nickname) {
                   _this.globalData.nickname = result.result.data.nickname;
                 }

                 //存在多个商户号时
                 if (result.result.data.shopidlist && result.result.data.shopidlist.length > 0) {
                   //只返回一个时，查询当前用户绑定角色职能关系
                   if (result.result.data.shopidlist.length == 1) {
                     _this.globalData.shopid = result.result.data.shopidlist[0];
                     _this.toGetBranchList();
                     _this.toGetUserRole();
                     _this.toGetShopInfo();
                   } else {
                     // 存在多个商户号时，跳转到选择商户页面
                     wx.redirectTo({
                       url: '../../pages/shoplist/shoplist',
                     })
                   }
                 } else {
                   _this.globalData.isbindrole = false;
                   _this.globalData.rolenumber = '';
                   _this.globalData.rolename = '';
                 }

                 resolve(result);

               } else {
                 wx.showModal({
                   title: '提示',
                   content: result.success.message,
                   showCancel: false
                 })
                 reject('error');
               }
             } else {
               wx.showModal({
                 title: '提示',
                 content: result.error.message,
                 showCancel: false
               })
               reject('error');
             }
           })
         }
       });

     });

   },
   //获取门店列表
   toGetBranchList: function() {
     var _this = this;
     var postData = {
       'shopid': _this.globalData.shopid,
       'from': 'wxapp',
       'openid': _this.globalData.openid
     };
     http.httpPost(api.ObtainBranchList, postData, (res) => {

       if (res.success) {
         var _result = res.result;
         if (_result.success) {
           var branchList = _result.data;
           var branchNameList = ['全部门店'];
           for (var i = 0; i < branchList.length; i++) {
             branchNameList.push(branchList[i].branch_name);
           }

           wx.setStorageSync(_this.globalData.branchListStorageKey, branchList);
           wx.setStorageSync(_this.globalData.branchCityListStorageKey, branchNameList)

         } else {
           wx.showModal({
             title: '提示',
             content: _result.message,
             showCancel: false
           })
         }
       } else {
         wx.showModal({
           title: '提示',
           content: res.error.message,
           showCancel: false
         })
       }
     });
   },
   toGetShopInfo: function() {
     var _this = this;
     var postData = {
       'shopid': _this.globalData.shopid
     };
     http.httpPost(api.GetShopInfo, postData, (res) => {

       if (res.success) {
         var _result = res.result;
         if (_result.success) {
           _this.globalData.shopname = _result.data.shopname;
           _this.globalData.productname = _result.data.product;
           _this.globalData.auth_num = _result.data.auth_num;

         } else {
           wx.showModal({
             title: '提示',
             content: _result.message,
             showCancel: false
           })
         }
       } else {
         wx.showModal({
           title: '提示',
           content: res.error.message,
           showCancel: false
         })
       }

     });
   },

   //获取用户的绑定职能角色
   toGetUserRole: function() {
     var _this = this;
     var postData = {
       'shopid': _this.globalData.shopid,
       'openid': _this.globalData.openid
     };
     http.httpPost(api.ObtainUserRole, postData, function(res) {
       console.log(res);
       if (res.success) {
         var _result = res.result;
         if (_result.success) {
           _this.globalData.isbindrole = true;
           _this.globalData.rolenumber = _result.data.rolenumber;
           _this.globalData.rolename = _result.data.rolename;
           _this.globalData.adminid = _result.data.adminid;
           if (_result.data.rolenumber != 'admin') {
             _this.globalData.func_modular = _result.data.func_list
           }
         } else {
           _this.globalData.isbindrole = false;
           _this.globalData.rolenumber = '';
           _this.globalData.rolename = '';
           wx.showModal({
             title: '提示',
             content: _result.message,
             showCancel: false
           })
         }
       } else {
         wx.showModal({
           title: '提示',
           content: res.error.message,
           showCancel: false
         })
       }
     });
   }
 });

小程序页面的代码 onlaod的事件得写在 Promise 的then方法里

  onLoad: function() {

     var _this = this;
     app.toLogin().then(function(res) {
       console.log('登录后');
       console.log(res);
       if (app.globalData.shopid) {
         _this.toGetKanBanData();
         _this.toGetSaleDetail();
         _this.toGuestOrderDetail();
       }
     });

   },