GeneB-miniprogram/src/pages/2/index.ts

const _app = getApp<IAppOption>();

Page({
  data: {
    current: 0,
  },
  onLoad() {},
  handlePage1() {
    this.setData({
      current: 1,
    });
  },
  handlePage2() {
    this.setData({
      current: 2,
    });
  },
  handlePage3() {
    wx.navigateBack();
  },
});

export {};