console 命令行工具 X clear
console
<table border="1" style={{margin:200}}>
      <tbody>
        <tr>
          <th colspan="2">我是占位符</th>
          <th colspan="2">我是占位符</th>
        </tr>
        <tr>
          <th rowspan="2">我是占位符</th>
          <th>我是占位符</th>
          <th>我是占位符</th>
          <th>我是占位符</th>
        </tr>
        <tr>
          <th>我是占位符</th>
          <th>我是占位符</th>
          <th>我是占位符</th>
        </tr>
      </tbody>
    </table>