			        <table class="table table-hover table-bordered">
						<thead>
							<tr class="info">
			                    <th>知识点</th>
								<th>总数</th>
								<th>简单</th>
								<th>中等</th>
								<th>复杂</th>
			                </tr>
			            </thead>
			            <tbody>
		                    {x2;tree:$rs,r,rid}
							<tr>
								<td>{x2;v:r['knows']}</td>
								<td>{x2;v:r['number']}</td>
								<td>{x2;if:v:r['easy']}{x2;v:r['easy']}{x2;else}不限{x2;endif}</td>
								<td>{x2;if:v:r['mid']}{x2;v:r['mid']}{x2;else}不限{x2;endif}</td>
								<td>{x2;if:v:r['hard']}{x2;v:r['hard']}{x2;else}不限{x2;endif}</td>
							</tr>
							{x2;endtree}
			        	</tbody>
			        </table>