<a class="button1" href="#">DİV ELEMENTİNE VERİLERİ AKTAR</a>
<a class="button2" href="#">DİV ELEMENTİNE VERİLERİ GÖSTER</a>
<span></span>

a{display: inline-block; background: #00FF99; padding:20px; border-bottom:4px solid #00CC00; color:#00CC99; text-decoration:none; margin-bottom:20px;}

$(".button1").click(function(){
  $("span").data("greeting", "W3TR");
});
$(".button2").click(function(){
  alert($("span").data("greeting"));
});