vue 进入页面与离开页面触发事件

1.切换进入当前路由之前的钩子函数 beforeRouteEnter

<script>
export default {
  beforeRouteEnter(to, form, next) {
    next()
  }
}
</script>

　　2.离开当前路由之前的钩子函数 beforeRouteLeave

<script>
export default {
  beforeRouteLeave(to, form, next) {
    next()
  }
}
</script>