javascript - why this code has error -

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//this part of html code <form>     <b>user:</b> <input type="text" name="user" size="25"/>     <input type="button" name ="submit" value="confirm" onclick= "mehdi(this.form)"/> </form> <script type="text/javascript">     function mehdi(rno){         rno.user.value =  2 * math.pi ;//this error line user unknown           alert(rno);         return rno;     } </script>

what can do?

try this

<form>     <b>user:</b> <input type="text" name="user" size="25"/>  <input type="button" name ="submit" value="confirm" onclick= "mehdi(this.form)"> </form>   <script type="text/javascript">           function mehdi(rno)           {            rno.user.value =  2 * math.pi ;//this error line user unknown              alert(rno.user.value);            return rno.user.value;            }   </script>

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