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Attributes/addClass

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addClass( class )

Adds the specified class(es) to each of the set of matched elements.
Arguments:
classString
One or more classes to add to the elements, these are separated by spaces.
Examples:

Adds the class 'selected' to the matched elements.

$("p:last").addClass("selected");

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
  
  <script>
  $(document).ready(function(){
    $("p:last").addClass("selected");
  });
  </script>
  <style>
  p { margin: 8px; font-size:16px; }
  .selected { color:blue; }
  .highlight { background:yellow; }
  </style>
</head>
<body>
  <p>Hello</p>
  <p>and</p>
  <p>Goodbye</p>
</body>
</html>

Adds the classes 'selected' and 'highlight' to the matched elements.

$("p:last").addClass("selected highlight");

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
  
  <script>
  $(document).ready(function(){
    $("p:last").addClass("selected highlight");
  });
  </script>
  <style>
  p { margin: 8px; font-size:16px; }
  .selected { color:red; }
  .highlight { background:yellow; }
  </style>
</head>
<body>
  <p>Hello</p>
  <p>and</p>
  <p>Goodbye</p>
</body>
</html>

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