大佬们看看，down一些代码，显示错误，是什么问题？
js： Page({ formSubmit: function(e) { console.log(app.globalData.userInfo.nickName); wx.showToast({ title: '评论成功', icon: 'success', duration: 3000 }) var that = this; var liuyantext = e.detail.value.liuyantext; //获取表单所有name=liuyantext的值 console.log('视频id' + that.data.id); console.log('留言number:' + that.data.number); wx.request({ url: 'https://xxxx/comment', data: { content: liuyantext, number: that.data.number, id: that.data.id }, header: { 'Content-Type': 'application/json' }, success: function(res) { // console.log(res.data) that.setData({ showOrHidden: true, re: res.data, keyValue:'', photo2: res.data.result.comment.photo, nickname2: res.data.result.comment.nickname, date2: res.data.result.comment.date, comment2: res.data.result.comment.comment }) wx.hideToast(); console.log(res); } }) }, }) 错误提示： WAServiceMainContext.js:2 ReferenceError: app is not defined at Br.formSubmit (community.js? [sm]:4) at Object.r.safeCallback (WASubContext.js?t=wechat&s=1682580082697&v=2.19.4:2) at WASubContext.js?t=wechat&s=1682580082697&v=2.19.4:2 at wn (WASubContext.js?t=wechat&s=1682580082697&v=2.19.4:2) at WASubContext.js?t=wechat&s=1682580082697&v=2.19.4:2 at g (WASubContext.js?t=wechat&s=1682580082697&v=2.19.4:2) at WASubContext.js?t=wechat&s=1682580082697&v=2.19.4:2 at WASubContext.js?t=wechat&s=1682580082697&v=2.19.4:2 at WAServiceMainContext.js:2 at a (VM16 asdebug.js:10)(env: Windows,mp,1.06.2301160; lib: 2.19.4)
