vant4 van-tabbar组件使用

<van-tabbar v-model="active" @change="onChange">
      <van-tabbar-item icon="home-o">1</van-tabbar-item>
      <van-tabbar-item icon="column">2</van-tabbar-item>
      <van-tabbar-item icon="chat">3</van-tabbar-item>
      <van-tabbar-item icon="manager">4</van-tabbar-item>
    </van-tabbar>

import { ref, onMounted } from "vue";
import { useRouter } from "vue-router";

const router = useRouter();

let active = ref(0);
//获取当前路由使得刷新页面后，导航位置不变
onMounted(() => {
console.log("router.currentRoute",router.currentRoute);

  active.value =
    router.currentRoute.value.path == "/userRecruit"
      ? 0
      : router.currentRoute.value.path == "/jobFair"
      ? 1
      : router.currentRoute.value.path == "/messageview"
      ? 2
      : 3;
});

function onChange(index) {
  if (index == 0) {
    router.replace("/");
  } else if (index == 1) {
    router.replace("/");
  } else if (index == 2) {
    router.replace("/");
  } else if (index == 3) {
    router.replace("/");
  }
}