jquery - How can I show div when onbeforeunload -


i have custom alert message made div. how can fade in div when page want reload or close ? other better suggestion that? thanks

	  window.onbeforeunload = function() {           $(".alert").fadein();        }
.alert{    height:80px;    width:200px;    padding:10px;    text-align:center;    border:1px solid #000;    display:none;    }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="alert">are sure ?</div>


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