JavaScript Tutorial

.first()

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>first demo</title>
  <style>
  .highlight{
    background-color: yellow
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<p>
  <span>Look:</span>
  <span>This is some text in a paragraph.</span>
  <span>This is a note about it.</span>
</p>
<script>
$( "p span" ).first().addClass( "highlight" );
</script>
</body>
</html>