#div1 {width:488px;height:70px;padding:10px;border:1px solid #aaaaaa;}
<script type="text/javascript">
ev.dataTransfer.setData("Text",ev.target.id);
var data=ev.dataTransfer.getData("Text");
ev.target.appendChild(document.getElementById(data));
<p>请把 W3xue 的图片拖放到矩形中:</p>
<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<img id="drag1" src="/img/w3xue_logo_white.jpg" draggable="true" ondragstart="drag(event)" />