javascript - jquery addClass adding subclass not working -

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this 1st time posting here, can give me advice!

<html>  <head>    <style>     </style>    <script src="jquery-1.5.2.js"></script>  </head>  <body>   <div  class="super" style="  border: solid black 1px;  height:100px; width:100px; "> </div>   <div class="super .eight" style="  background: blue; "> </div>    <script>    $(".super").click(function () {       $(this).addclass(" .eight"); }); </script>   </body>  </html>

so problem want add example background or other type of element onto class defined super. trying use subclasses not seem working.

please ask me if there unclear, apologize if there is.

no dot (in classname).

 $(".super").click(function () { $(this).addclass("eight"); });

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