/**  * 调用微信登录  */ function loginByWeixin() {     let code = null;     return new Promise(function(resolve, reject) {         return util.login().then((res) => {             code = res.code;             return util.getUserInfo();         }).then((userInfo) => {             //登录远程服务器             util.request(api.AuthLoginByWeixin, {                 code: code,                 userInfo: userInfo             }, 'POST').then(res => {                 if (res.errno === 0) {                     //存储用户信息                     wx.setStorageSync('userInfo', res.data.userInfo);                     wx.setStorageSync('token', res.data.token);                     resolve(res);                 } else {                     reject(res);                 }             }).catch((err) => {                 reject(err);             });         }).catch((err) => {             reject(err);         })     }); } function request(url, data = {}, method = "GET") {     return new Promise(function(resolve, reject) {         wx.request({             url: url,             data: data,             method: method,             header: {                 'Content-Type': 'application/json',                 'X-Nideshop-Token': wx.getStorageSync('token')             },             success: function(res) {                 if (res.statusCode == 200) {                     if (res.data.errno == 401) {                         //需要登录后才可以操作                         let code = null;                         return login().then((res) => {                             code = res.code;                             return getUserInfo();                         }).then((userInfo) => {                             //登录远程服务器                             request(api.AuthLoginByWeixin, {                                 code: code,                                 userInfo: userInfo                             }, 'POST').then(res => {                                 if (res.errno === 0) {                                     //存储用户信息                                     wx.setStorageSync('userInfo', res.data.userInfo);                                     wx.setStorageSync('token', res.data.token);                                     resolve(res);                                 } else {                                     reject(res);                                 }                             }).catch((err) => {                                 reject(err);                             });                         }).catch((err) => {                             reject(err);                         })                     } else {                         resolve(res.data);                     }                 } else {                     reject(res.errMsg);                 }             },             fail: function(err) {                 reject(err)             }         })     }); } function login() {     return new Promise(function(resolve, reject) {         wx.login({             success: function(res) {                 if (res.code) {                     //登录远程服务器                     resolve(res);                 } else {                     reject(res);                 }             },             fail: function(err) {                 reject(err);             }         });     }); } function getUserInfo() {     return new Promise(function(resolve, reject) {         wx.getUserInfo({             withCredentials: true,             success: function(res) {                 resolve(res);             },             fail: function(err) {                 reject(err);             }         })     }); }