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访问当前路由

我们在setup函数中我们用useRouter来访问this.$router，使用useRoute来访问this.$route

import { useRouter, useRoute } from 'vue-router'

export default {
  setup() {
    const router = useRouter()
    const route = useRoute()

    function pushWithQuery(query) {
      router.push({
        name: 'search',
        query: {
          ...route.query,
        },
      })
    }
  },
}
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其中route 是一个响应式的对象，所以我们可以对他的任何属性进行监听，但是应该尽量避免监听整个对象，应该直接监听希望改变的参数

import { useRoute } from 'vue-router'
import { ref, watch } from 'vue'

export default {
  setup() {
    const route = useRoute()
    const userData = ref()

    // 当参数更改时获取用户信息
    watch(
      () => route.params.id,
      async newId => {
        userData.value = await fetchUser(newId)
      }
    )
  },
}
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导航守卫

在组合式api中只有离开守卫和更新守卫

import { onBeforeRouteLeave, onBeforeRouteUpdate } from 'vue-router'
import { ref } from 'vue'

export default {
  setup() {
    // 与 beforeRouteLeave 相同，无法访问 `this`
    onBeforeRouteLeave((to, from) => {
      const answer = window.confirm(
        'Do you really want to leave? you have unsaved changes!'
      )
      // 取消导航并停留在同一页面上
      if (!answer) return false
    })

    const userData = ref()

    // 与 beforeRouteUpdate 相同，无法访问 `this`
    onBeforeRouteUpdate(async (to, from) => {
      //仅当 id 更改时才获取用户，例如仅 query 或 hash 值已更改
      if (to.params.id !== from.params.id) {
        userData.value = await fetchUser(to.params.id)
      }
    })
  },
}
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useLink

import { RouterLink, useLink } from 'vue-router'
import { computed } from 'vue'

export default {
  name: 'AppLink',

  props: {
    // 如果使用 TypeScript，请添加 @ts-ignore
    ...RouterLink.props,
    inactiveClass: String,
  },

  setup(props) {
    const { route, href, isActive, isExactActive, navigate } = useLink(props)

    const isExternalLink = computed(
      () => typeof props.to === 'string' && props.to.startsWith('http')
    )

    return { isExternalLink, href, navigate, isActive }
  },
}
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