JQuery Nur Zahl der 10 -Ziffern erlaubt

<script type="text/javascript">
  $(document).ready(function() {	
  $("#phone_work").attr("maxlength", "10");
  $("#phone_work").keypress(function(e) {
    var kk = e.which;
    if(kk < 48 || kk > 57)
      e.preventDefault();
  });
});
</script>
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