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.cloneを使用してコンテンツを変数に取り込み、 を使用append()してそれを新しい変数に適用してみてください。<div>
.clone
append()
<div>
$(document).ready(function() { $("ul li").mouseover(function() { var list = $(this).find("ul").clone(); $('#menuDisplay').empty().append(list); }); });