��到该按钮，若未指定，则自动创建一个按钮。<br>
                button selector, such as "#btn1", if has value, bind it to the emoji panel. If it is empty, then
                automatically creates a button.
            </td>
        </tr>
        <tr>
            <td>showTab</td>
            <td>Boolean</td>
            <td>true</td>
            <td>
                当只有一组表情时，是否仍然显示Tab。<br>
                if show tab when only one emoji group.
           