?<table?border="1">
????????<caption>前端三劍客</caption>
????????<tr>
????????????<th>知識點(diǎn)</th>
????????????<th>重要程度</th>
????????????<th>難度</th>
????????????<th>學(xué)習(xí)周期</th>
????????</tr>
????????<tr>
????????????<td>html</td>
????????????<td>5星</td>
????????????<td>3星</td>
????????????<td>7天</td>
????????</tr>
????????<tr>
????????????<td>css</td>
????????????<td>5星</td>
????????????<td>4星</td>
????????????<td>10天</td>
????????</tr>
????????<tr>
????????????<td>js</td>
????????????<td>5星</td>
????????????<td>5星</td>
????????????<td>20天</td>
????????</tr>
????</table>