//第一次請求登錄接口時保存到sessionid中

success: function (res) {     wx.hideLoading();     wx.removeStorageSync('sessionid');//每次登錄時清楚緩存     if (res.data.code == "0000") {      if (res.data.data.roleList[0].value =='student'){       wx.showToast({        title: '登錄成功',        icon: 'success',        duration: 1000       })       wx.setStorageSync('sessionid', res.header['Set-Cookie']); //保存Cookie到Storage              }     } else {      wx.showToast({       title: '登錄失敗',       icon: 'none',       duration: 2000      })     }    },

wx.request({   url: 'https://xxxx/examResult/selectWxListStudentStudyStatistic',   method: 'post',   header: {    'content-type': 'application/x-www-form-urlencoded',//解決請求不到數據    'cookie': wx.getStorageSync("sessionid")//讀取sessionid,當作cookie傳入后臺將PHPSESSID做session_id使用   },   success: function (res) {     wx.hideLoading();//去掉loading   },   fail: function (e) {    wx.showToast({     title: '服務器出現錯誤',     icon: 'none',     duration: 2000    })   }  })