<p>Forced asynchronous loading child nodes of parent node ( for ES6 Promise ). It is valid when <spanclass="highlight_red">[setting.async.enable = true]</span>
</p>
<pclass="highlight_red">You can use this method to reload child nodes.</p>
<pclass="highlight_red">Please use zTree object to executing the method.</p>
<pclass="highlight_red">v3.5.29+</p>
</div>
</div>
<h3>Function Parameter Descriptions</h3>
<divclass="desc">
<h4><b>parentNode</b><span>JSON</span></h4>
<p>The parent node which will asynchronous loading child nodes.</p>
<pclass="highlight_red">1. If parentNode = null, it is same as reload root nodes.</p>
<pclass="highlight_red">2. If parentNode.isParent = false, don't load nodes.</p>
<pclass="highlight_red">3. Please ensure that this data object is an internal node data object in