tryjsref_ondragover_addeventlistener 在线代码实例

实例代码( Tip: 登录后体验更佳 )
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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title>
<style>
#droptarget {
    float: left; 
    width: 200px; 
    height: 45px;
    margin: 55px;
    margin-top: 155px;
    padding: 10px;
    border: 1px solid #aaaaaa;
}
</style>
</head>
<body>
<p>该实例演示了如何使用 addEventListener() 方法向文档对象添加 "ondragstart", "ondrag", "ondragover" 和 "ondrop" 事件。 </p>
<p draggable="true" id="dragtarget">把我拖动到矩形框中!</p>
<div id="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>
var drag = document.getElementById("dragtarget");
var drop = document.getElementById("droptarget");
/* 拖动时触发 */
drag.addEventListener("dragstart", function(event) {
    event.dataTransfer.setData("Text", event.target.id);
});
drag.addEventListener("drag", function(event) {
    document.getElementById("demo").innerHTML = "p 元素正在拖动";
});
/* 拖动时触发*/
drop.addEventListener("dragover", function(event) {
    event.preventDefault();
 
 
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