微信小程序学习用：年会签到；数据绑定学习

//index.js //获取应用实例 var app = getApp(); Page({     data: {         userInfo: {},         isHideLoading: false,         signinText: "一键签到",         isSignined: false,     },     onLoad: function() {         var that = this;         setTimeout(function() {             that.initData();         }, 1500);         console.log("onLoad");     },     initData: function() {         var that = this;         app.getUserInfo(function(userInfo) {             //更新数据             that.setData({                 userInfo: userInfo,                 isHideLoading: true             });         });     },     onSignin: function(e){         if(this.data.isSignined){             wx.showModal({                 title:"提示",                 content:"开发中...",                 confirmText: "确定",                 cancelText: "",                 duration: 1500             });             return;         }         this.setData({             isHideLoading: false,         });         var that = this;         setTimeout(function(){             that.setData({                 isHideLoading: true,                 signinText: "我要抽奖",                 isSignined: true             });             wx.showToast({                 title:"签到成功",                 duration: 1500             });             app.signined = true;             console.log(app);         },500);     },     onReady: function(){         console.log("onReady");     },     onScan: function(e){         var that = this;         wx.scanCode({             success: function(res){                 var result = JSON.stringify(res);                  wx.showModal({                     title:"扫码结果",                     content:result,                     duration: 1500                 });             },             fail: function(e){              }         })     },     onHide: function(){         console.log("onHide");     },     onShow:function(){         console.log("onShow");     },     onUnload:function(){         console.log("onUnload");     },     onShareAppMessage: function(e){         wx.showToast({             title:"share everything",             duration: 1500         });         return {          }     }  })