my_loan/htmldev/shiningWxMini/custom-tab-bar/index.js

const app = getApp()
Component({
  /**
   * 组件的属性列表
   */
  properties: {},

  /**
   * 组件的初始数据
   */
  data: {
    active: 'pages/home/home',
    list: app.globalData.tabBarList
  },
  lifetimes: {
    attached() {
      this.setData({
        list: app.globalData.tabBarList
      })

      app.addTabBarList = res => {
        this.setData({
          list: res
        })
      }
    }
  },
  /**
   * 组件的方法列表
   */
  methods: {
    onChange(e) {
      const detail = e.detail
      const page = getCurrentPages()

      if (page[page.length - 1].route !== detail) {
        wx.switchTab({
          url: `/${detail}`
        })
        if (detail === 'pages/mine/mine') {
          app.fetchUserData()
        }
      }

      this.setData({
        active: detail
      })
    },
    init() {
      const page = getCurrentPages().pop()

      this.setData({
        active: `${page.route}`
      })
    }
  }
})