easyui combobox添加清除选项按钮

<input class="easyui-combobox" name="appType" data-options=" icons:[{ iconCls:'icon-clear', handler: function(e){ $(e.data.target).combobox('clear'); } }], value:'', valueField:'appId', textField:'appName', panelHeight:'auto' url:'getAppTypeList.do'"/>