导航与路由，函数link的写法

import { ref } from 'vue'
import { useRouter } from 'vue-router'
export default {
  name: 'NavBar',
  props: {
    msg: String
  },
  setup() {
    const router = useRouter()
    const active = ref(0)

    const link = (path) => {
      router.push({ path })
    }

    return {
      active,
      link
    }