Generate Random Number

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I’m using the following javascript to generate a random number from a form. This is then used as a unique ID number field. Problem is it seems to fail about 10% of the time. Not sure if its failing from specific devices or browser settings. Is there a better or more reliable way of generating a number?

<input id="ID" name="Application_ID">
   <script type="text/javascript">
   document.getElementById("ID").value = Math.random();
   </script>