在线运行代码 - 菜鸟教程

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
<style>.droptarget {
    float: left; 
    width: 100px; 
    height: 35px;
    margin: 15px;
    margin-right: 100px;
    padding: 10px;
    border: 1px solid #aaaaaa;
}
</style>
</head>
<body>

<p>该实例演示了如何使用 HTML DOM 向 文档对象添加 "ondragstart", "ondrag", "ondragover" 和 "ondrop" 事件。 </p>
<p>在两个矩形框中来回拖动 p 元素:</p>
<div class="droptarget">
  <p draggable="true" id="dragtarget">拖动我!</p>
</div>
<div class="droptarget"></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>
/* 拖动时触发*/
document.ondragstart = function(event) {
    event.dataTransfer.setData("Text", event.target.id);
};
/* 拖动完成后触发 */
document.ondragenter = function(event) {
    if ( event.target.className == "droptarget" ) {
        document.getElementById("demo").innerHTML = "进入放置区域";
        event.target.style.backgroundColor = "lightblue";
    }
};
document.ondragover = function(event) {
    event.preventDefault();
};
document.ondragleave = function(event) {
    if ( event.target.className == "droptarget" ) {
        document.getElementById("demo").innerHTML = "离开放置区域";
        event.target.style.backgroundColor = "";
    }
};
document.ondrop = function(event) {
    event.preventDefault();
    if ( event.target.className == "droptarget" ) {
        event.target.style.backgroundColor = "";
        var data = event.dataTransfer.getData("Text");
        event.target.appendChild(document.getElementById(data));
    }
};
</script>

</body>
</html>
源代码

动行结果
