详解微信小程序的 request 封装示例

const request = function (path, method, data, header) { let user_id = ""; let token = ""; try {  user_id = wx.getStorageSync(USER_ID_KEY);  token = wx.getStorageSync(TOKEN_KEY); } catch (e) {} header = header || {}; let cookie = []; cookie.push("USERID=" + user_id); cookie.push("TOKEN=" + token); cookie.push("device=" + 1); cookie.push("app_name=" + 1); cookie.push("app_version=" + ENV_VERSION); cookie.push("channel=" + 1); header.cookie = cookie.join("; "); return new Promise((resolve, reject) => {  wx.request({//后台请求   url: API_BASE_URL + path,   header: header,   method: method,   data: data,   success: function (res) {    if (res.code) {     reject(res.data)    } else {     resolve(res.data)    }   },   fail: function (res) {    reject("not data");   }  }); });};

const login = function () { try {  wx.removeStorageSync(USER_ID_KEY);  wx.removeStorageSync(TOKEN_KEY) } catch (e) {} return new Promise((resolve, reject) => {  wx.login({   success: res => {    let code = res.code;    // 已经授权，可以直接调用 getUserInfo 获取头像昵称，不会弹框    wx.getUserInfo({     withCredentials: true,     success: res => {      let userInfo = res.userInfo;      let name = userInfo.nickName;      let avatar = userInfo.avatarUrl;      let sex = userInfo.gender;      let data = {       code: code,       encryptedData: res.encryptedData,       iv: res.iv,       name: name,       avatar: avatar,       sex: sex,       from: FROM,      };      request("/api/user_login/byWeChatApplet", "POST", data).then( (res)=>{       if (!res.code) {        try {         wx.setStorageSync(USER_ID_KEY, res.user_id);         wx.setStorageSync(TOKEN_KEY, res.token)        } catch (e) {         reject(JSON.stringify(e));        }       }       resolve(res)      }).catch( (errMsg)=>{       reject(errMsg)      });     },     fail: function (res) {      if (res.errMsg && res.errMsg.startsWith("getUserInfo:fail") && res.errMsg.search("unauthorized") !== -1) {       reject("getUserInfo:fail");       return;      }      wx.getSetting({       success: (res) => {        if (!res.authSetting["scope.userInfo"]) {//没授权         showModal('提示', '需要获取用户的权限,点击确定前往设置,打开用户信息', true, function (res) {          wx.openSetting({           success: (res) => {            // 用户返回 不管是否开启 接着去重新登录            login().then( (res)=>{             if (res.code) {              reject(res.message);              return             }             try {              wx.setStorageSync(USER_ID_KEY, res.user_id);              wx.setStorageSync(TOKEN_KEY, res.token)             } catch (e) {              reject(JSON.stringify(e));             }             resolve(res)            }).catch( (errMsg)=>{             reject(errMsg)            });           }          })         }, function () {})        }       }      });     }    })   }  }) });};