vant-weapp/example/pages/tab/index.js

import Page from '../../common/page';

Page({
  data: {
    tabs: [1, 2, 3, 4],
    tabsMore: [1, 2, 3, 4, 5, 6, 7, 8],
    scrollTop: 0
  },

  onClickDisabled(event) {
    wx.showToast({
      title: `标签 ${event.detail.index + 1} 已被禁用`,
      icon: 'none'
    });
  },

  onChange(event) {
    wx.showToast({
      title: `切换到标签 ${event.detail.index + 1}`,
      icon: 'none'
    });
  },

  onClick(event) {
    wx.showToast({
      title: `点击标签 ${event.detail.index + 1}`,
      icon: 'none'
    });
  },

  onPageScroll(event) {
    this.setData({
      scrollTop: event.scrollTop
    });
  }
});