// app.js
App({
  globalData: {
    userInfo: null,
    currentTab: 'index'
  },
  
  // 事件总线，用于页面间通信
  eventBus: {
    on(event, callback) {
      if (!this.handlers) this.handlers = {};
      if (!this.handlers[event]) this.handlers[event] = [];
      this.handlers[event].push(callback);
    },
    off(event, callback) {
      if (!this.handlers || !this.handlers[event]) return;
      this.handlers[event] = this.handlers[event].filter(handler => handler !== callback);
    },
    emit(event, data) {
      if (!this.handlers || !this.handlers[event]) return;
      this.handlers[event].forEach(handler => {
        try {
          handler(data);
        } catch (error) {
          console.error('事件处理函数执行错误:', error);
        }
      });
    }
  },
  
  // 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');
  }
});