jquery - add and remove class in query after click -

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i writing jquery function website. when user click of element add css class , after if click element remove class. here code:

<body> <dl>     <dt>what's name</dt>         <dd>my name name</dd>     <dt>what occupation</dt>         <dd>i web developer</dd>     <dt>what like</dt>         <dd>i programming</dd> </dl> <script src="../jquery-1.10.2.js"></script> <script>     $(document).ready(function(){         $("dd").hide();         $("dl").on("click", "dt", function(){             var $this = $(this);             $this.addclass("back")                     .next()                     .slidedown()                     .siblings("dd")                     .slideup()         });     }); </script> </body>

use following:

$("dl").on("click", "dt", function() {     var $this = $(this);         $this.siblings("dt").removeclass("back");         $this.addclass("back")                 .next()                 .slidedown()                 .siblings("dd")                 .slideup();          });

demo


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