const app = getApp();

Component({
  properties: {
    title: { type: String, value: '' },
    showBack: { type: Boolean, value: false }
  },
  data: {
    statusBarHeight: 20
  },
  lifetimes: {
    attached() {
      const h = (app.globalData && app.globalData.statusBarHeight) || 20;
      this.setData({ statusBarHeight: h });
    }
  },
  methods: {
    onBack() {
      const pages = getCurrentPages();
      if (pages.length > 1) {
        wx.navigateBack();
      } else {
        wx.reLaunch({ url: '/pages/index/index' });
      }
    }
  }
});