// app.js
App({
  globalData: {
    userInfo: null,
    currentTab: 'index'
  },
  
  // 更新当前选中的tab
  updateCurrentTab(tabName) {
    this.globalData.currentTab = tabName;
  },
  
  onLaunch() {
    console.log('App launched');
  },
  
  onShow() {
    console.log('App shown');
  },
  
  onHide() {
    console.log('App hidden');
  }
});