How to allow only numbers in javascript


function NumberOnly()
{
            var charCode = event.keyCode;
            if ((charCode > 31 && (charCode < 48 || charCode > 57 || charCode == 46))
              && ((charCode == 37 || charCode > 47) && (charCode < 48 || charCode > 58 || charCode                            ==       46)))
{
             return false;
 }
            return true
  }

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