确认导航未显示我的消息

Question

我已经使用了这个，但它没有显示我的自定义消息，而是显示了自己的消息

<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，到目前为止Firefox尚不支持。