setInterval(funtion(),time) change time on runtime

i want to change setInterval funtion time when my code is running.

i try this

<script type="text/javascript">
         $(function () {
             var timer;
             function come() { alert("here"); }
             timer = setInterval(come, 0);
             clearInterval(timer);
             timer = setInterval(come, 10000);
         });
     </script>
 

first SetInterval not work!!

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