new_file.html

<!DOCTYPE HTML>
<html>
<head>
	    <meta charset="utf-8">
<style>
.droptarget {
    float: left; 
    width: 100px; 
    height: 35px;
    margin: 15px;
    padding: 10px;
    border: 1px solid #aaaaaa;
}
</style>
</head>
<body>

<p>在两个矩形框中来回拖动 p 元素:</p>

<div class="droptarget" ondrop="drop(event)" ondragover="allowDrop(event)">
  <p ondragstart="dragStart(event)" ondrag="dragging(event)" draggable="true" id="dragtarget">拖动我!</p>
</div>

<div class="droptarget" ondrop="drop(event)" ondragover="allowDrop(event)"></div>

<p style="clear:both;"><strong>注意：</strong>Internet Explorer 8 及更早 IE 版本或 Safari 5.1 及更早版本的浏览器不支持 drag 事件。</p>

<p id="demo"></p>

<script>
function dragStart(event) {
    event.dataTransfer.setData("Text", event.target.id);
}

function dragging(event) {
    document.getElementById("demo").innerHTML = " p 元素正在拖动";
	console.log(event);
	
}

function allowDrop(event) {
    event.preventDefault();
}

function drop(event) {
    event.preventDefault();
    var data = event.dataTransfer.getData("Text");
    event.target.appendChild(document.getElementById(data));
    document.getElementById("demo").innerHTML = "p 元素已被拖动";
}
</script>

</body>
</html>