pay-customer/dist/dev/mp-weixin/custom-tab-bar/index.js

const App =  getApp();
Component({
  data: {
    selected: App.globalData.selectedIndex,
    color: "#3D3D3D",
    selectedColor: "#3D3D3D",
    list: [{
      pagePath: "/pages/index/index",
      iconPath: "/static/tabbar/home_icon.png",
      selectedIconPath: "/static/tabbar/home_active.png",
      text: "首页"
    }, {
      pagePath: "/pages/me/index",
      iconPath: "/static/tabbar/news_icon.png",
      selectedIconPath: "/static/tabbar/news_active.png",
      text: "我的"
    },]
  },
  lifetimes: {
    attached: function() {
      // 监听路由变化，自动更新tab-bar选中状态
      const updateTabBar = () => {
        let _this = this
        const pages = getCurrentPages()
        const currentPage = pages[pages.length - 1]
        console.log('currentList', getApp().globalData.menuList)
        if (currentPage) {
          const currentPath = currentPage.route
          const index = this.data.list.findIndex(item => item.pagePath === `/${currentPath}`)
          if (index !== -1) {
            this.setData({
              selected: index,
              list: getApp().globalData.menuList
            })
            App.globalData.selectedIndex = index
          }
        }
      }
      // 初始化时执行一次
      updateTabBar()
      // 注册路由监听
      wx.onAppRoute(updateTabBar)
    }
  },
  ready() {
    this.setData({
      list: getApp().globalData.menuList,
      selected: App.globalData.selectedIndex || 0
    })
  },
  methods: {
    switchTab(e) {
      const data = e.currentTarget.dataset
      const url = data.path
      App.globalData.selectedIndex = data.index
      console.log('App.globalData.selectedIndex', data)
      this.setData({
        selected: data.index,
        list: getApp().globalData.menuList
      })
        console.log('switchTab fail', url)
       wx.switchTab({url, fail: (res) => {
        // wx.navigateTo({url})
        console.log('switchTab fail', res)
      }})
    }
  }
})