my.getAppIdSync

// Get App ID synchronously
const result = my.getAppIdSync();
console.log('App ID:', result.appId);

// Use in page
Page({
  onLoad() {
    const { appId } = my.getAppIdSync();
    this.setData({ appId });
  },

  data: {
    appId: ''
  }
});

Page({
  onLoad() {
    const { appId } = my.getAppIdSync();

    // Different behavior for different app versions
    if (appId === 'your-production-app-id') {
      this.initProductionFeatures();
    } else {
      this.initDevelopmentFeatures();
    }
  }
});

function logEvent(eventName, data) {
  const { appId } = my.getAppIdSync();

  my.request({
    url: 'https://analytics.example.com/log',
    method: 'POST',
    data: {
      appId,
      event: eventName,
      ...data
    }
  });
}