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Welcome to JS Bin
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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
    
    <div data-color="red" class="example">aj </div>
    <div data-color="green" class="example">b</div>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
</body>
</html>
 
.example {
    width: 100px;
    height: 100px;
    /* background: red; */
    margin: 2em;
}
 
$( "div.example" ).css( "background", function( index ) {
  // return index * 5;
    var color = $(this).attr('data-color');
    console.log(color);
    return color;
});
Output

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