Please put this code to the page to solve this issue.
<script type="text/javascript">
(function($){
var keydownHandler = $.fn.maskedbox.defaults.inputEvents.keydown;
$.extend($.fn.maskedbox.defaults.inputEvents, {
keydown: function(e){
if (e.keyCode >= 96 && e.keyCode <= 105){
e.keyCode -= 48;
}
return keydownHandler.call(this,e);
}
})
})(jQuery);
</script>
Or download a newer version from
https://www.jeasyui.com/download/v155.php