wx-parent/custom-tab-bar/index.js

const app = getApp();

Component({
  data: {
    selected: 0,
    list: [
      {
        pagePath: "/pages/index/index",
        text: "教学",
        iconPath: "/image/shouye.png",
        selectedIconPath: "/image/shouye_1.png"
      },
      {
        pagePath: "/pages/groupbuying/groupbuying",
        text: "团购",
        iconPath: "/image/tuangou.png",
        selectedIconPath: "/image/tuangou_1.png"
      },
      {
        pagePath: "/pages/shoppingcart/shoppingcart",
        text: "购物车",
        iconPath: "/image/gouwuche.png",
        selectedIconPath: "/image/gouwuche_1.png"
      },
      {
        pagePath: "/pages/me/me",
        text: "我的",
        iconPath: "/image/me.png",
        selectedIconPath: "/image/my_1.png"
      }
    ]
  },
  methods: {
    onTabTap(e) {
      const index = e.currentTarget.dataset.index;
      const target = this.data.list[index];

      // 判断登录状态
      // const isLoggedIn = wx.getStorageSync('userInfo');
      // if (!isLoggedIn && index !== 0) {
      //   // 非首页才拦截
      //   wx.showModal({
      //     title: '去登录',
      //     content: '防止账号丢失以及方便找回,建议您绑定手机号码',
      //     confirmText: '去绑定',
      //     cancelText: '取消',
      //     success(res) {
      //       if (res.confirm) {
      //         wx.navigateTo({
      //           url: '/pages/logins/logins'
      //         });
      //       }
      //     }
      //   });
      //   return;
      // }
      const isLoggedIn = wx.getStorageSync('userInfo');
      if (!isLoggedIn && index !== 0) {
        wx.showModal({
          title: '登录身份选择',
          content: '请选择您的身份以完成登录',
          confirmText: '我是家长',
          cancelText: '我是老师',
          success: (res) => {
            if (res.confirm) {
              wx.navigateTo({
                url: '/pages/logins/logins'
              });
            } else if (res.cancel) {
              wx.navigateToMiniProgram({
                appId: 'wx06f2b1b09ac5684f',
                path: 'pages/logins/logins',
              });
            }
          }
        });
        return;
      }

      // 切换 tab 页
      wx.switchTab({
        url: target.pagePath
      });
      this.setData({ selected: index });
    },

    // 支持外部更新选中项
    setSelected(index) {
      this.setData({ selected: index });
    }
  }
});