Q1604 How can I ask a user for input using a prompt and validate whether or not it is a number?

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Q1604 How can I ask a user for input using a prompt and validate whether or not it is a number?

Try:

<script language="JavaScript"><!--
var val = prompt('enter an number');
while (parseInt(val) != val) {
  val = prompt('enter an number');
}
//--></script>