Thank you sir. But I mean toggle icon when click button.
Finally back to use Div instead array.
<div class="easyui-panel" title="Custom Panel Tools" style="width:700px;height:400px;padding:10px;"
data-options="iconCls:'icon-save',closable:true,tools:'#tt'">
</div>
<div id="tt">
<a id="btnadd" href="javascript:void(0)" class="icon-add" onclick="toggleIcon(this)"></a>
<a href="javascript:void(0)" class="icon-cut" onclick="javascript:alert('cut')"></a>
<a href="javascript:void(0)" class="icon-help" onclick="javascript:alert('help')"></a>
</div>
<script type="text/javascript">
function toggleIcon(obj) {
var className = obj.className;
if (~className.indexOf('icon-add')) {
obj.className = className.replace('icon-add', 'icon-edit');
} else {
obj.className = 'icon-add panel-tool-a';
}
}
</script>