确认导航不显示我的消息

Question

I have used this but it is not showing my custom message instead it is showing its own message

<script language="JavaScript">


 var needToConfirm = true;

  window.onbeforeunload = confirmExit;
  function confirmExit()
  {
    if (needToConfirm)
      return "You have attempted to leave this page.  If you have made any changes to the fields without clicking the Save button, your changes will be lost.  Are you sure you want to exit this page?";
  }
</script>

Answer 1

自定义消息仅在Google chrome中显示，Firefox到目前为止尚不支持。