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我如何找到正在处理 window.onbeforeunload 的事件？例如刷新、返回、浏览器关闭等

<script language="JavaScript" type="text/javascript">
  window.onbeforeunload = confirmExit;
  function confirmExit()
  {
    alert('here i need to show which event is working')
    return "";
  }
</script>
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