10 - 生命周期钩子


Child.vue 中添加 销毁的钩子函数
```vue

<script setup lang="ts">
import { onMounted, inject,onBeforeUnmount } from "vue"
onBeforeUnmount(()=>{
   //if(timer.value)  clearInterval(timer.value)
   timer.value && clearInterval(timer.value)
})

</script>

```

