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check_callback设置为true，并且包含插件dnd，但拖放功能未启用。当我尝试拖动树叶时，看到“无法拖动”图标。我错过了什么？jstree拖放不工作
HTML：
<html>
<head>
<link rel="stylesheet" href="themes/default/style.min.css"/>
<script type="text/javascript" src="jquery-1.8.2.js"></script>
<script type="text/javascript" src="jstree.js"></script>
<script type="text/javascript" src="index.js"></script>
</head>
<body>
<table>
<tr>
<th>Tree</th>
</tr>
<tr>
<td><div id="jstree"></div></td>
</tr>
</table>
</body>
</html>
JS：
/*jslint browser: true*/
/*globals $, alert*/
$(function() {
'use strict';
var jstreeOriginal = $('#jstree');
jstreeOriginal.bind("loaded.jstree", function() {
jstreeOriginal.jstree("open_all");
});
jstreeOriginal.jstree({
"core": {
"check_callback": true,
"themes": { "stripes": true },
"data": [
{ "id" : "ajson1", "parent" : "#", "text" : "Root node" },
{ "id" : "ajson2", "parent" : "ajson1", "text" : "Child node" },
{ "id" : "ajson3", "parent" : "ajson2", "text" : "Sub Child 1" },
{ "id" : "ajson4", "parent" : "ajson2", "text" : "Sub Child 2" },
],
"plugins": [ "dnd", "wholerow" ]
}
});
});