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Welcome to JS Bin
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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <div class="red">Should Alert True</div>
</body>
</html>
 
    var _hasClass = $.fn.hasClass;
    $.fn.hasClass = function (classNames) {
      if (!classNames || typeof classNames === "string" ) {
        return _hasClass.call(this, classNames); // Default behavior
      } else {
        // Take array and parse it for the filter method
        var classes = '.' + classNames.join(', .');
        return this.filter(classes).length > 0;
      }
    };
alert($("div").hasClass(['red','green','blue']) ? "true" : "false");
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