//app.js
							
								App({
							
								  onLaunch: function () {
							
								    //调用API从本地缓存中获取数据
							
								    var logs = wx.getStorageSync('logs') || []
							
								    logs.unshift(Date.now())
							
								    wx.setStorageSync('logs', logs)
							
								  },
							
								  getUserInfo:function(cb){
							
								    var that = this;
							
								    if(this.globalData.userInfo){
							
								      typeof cb == "function" && cb(this.globalData.userInfo)
							
								    }else{
							
								      //调用登录接口
							
								      wx.login({
							
								        success: function () {
							
								          wx.getUserInfo({
							
								            success: function (res) {
							
								              that.globalData.userInfo = res.userInfo;
							
								              typeof cb == "function" && cb(that.globalData.userInfo)
							
								            }
							
								          })
							
								        }
							
								      });
							
								    }
							
								  },
							
								  globalData:{
							
								    userInfo:null
							
								  }
							
								})