선택된 elements의 인덱스 N의 요소를 선택합니다.


  jQuery( ":eq(index)" )


<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>eq demo</title>
  <script src="//code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<table border="1">
  <tr><td>TD #0</td><td>TD #1</td><td>TD #2</td></tr>
  <tr><td>TD #3</td><td>TD #4</td><td>TD #5</td></tr>
  <tr><td>TD #6</td><td>TD #7</td><td>TD #8</td></tr>
</table>
 
<script>
$( "td:eq( 2 )" ).css( "color", "red" );
</script>
 
</body>
</html>


결과)

TD #0TD #1TD #2
TD #3TD #4TD #5
TD #6TD #7TD #


출처) http://api.jquery.com/eq-selector/