<HTML> <HEAD> <script language=Javascript> <!-- function isNumberKey(evt) { var charCode = (evt.which) ? evt.which : evt.keyCode; if (charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57)) return false; return true; } //--> </script> </HEAD> <BODY> <INPUT id="txtChar" onkeypress="return isNumberKey(event)"type="text" name="txtChar"> </BODY></HTML>这确实有效！
