/Html/Cambiar valor de atributo colspan jquery

Cambiar valor de atributo colspan jquery

<script type="text/javascript" >
	// cambiamos el valor del colspan
  	$("#nombres_dni").attr("colspan", 2);
</script>

<table>
  <thead>
    <tr>
      <th>#</th>
      <th colspan="1" id="nombres_dni">Nombres/DNI</th>
      <th>fecha</th>
    </tr>
   </thead>
   <tbody>
     <tr>
       <td>1</td>
       <td>Junior Cercado Vasquez</td>
       <td>78738239</td>
       <td>21-02-2022</td>
     </tr>
  </tbody>
</table>

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