​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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​
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<style>
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div {
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  background: limegreen;
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  color: white;
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  padding: 10px;
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  margin: 20px;
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}
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.different {
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  border: 5px solid orange;
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  background: gold;
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  color: black;
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}
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</style>
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
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<script>
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  $( function() {
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    $( "div" ).click( function() {
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      $( this ).addClass( "different" );
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    });
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  });
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</script>
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​
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<div>
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  Click me...
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</div>
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​
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<div>
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  No, click me!
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</div>