[JAVASCRIPT] 한글 입력 안되게하기

<script>
	$("#firstEmail").on("focus", function() {
		var x = $(this).val();
		$(this).val(x);
		}).on("focusout", function() {
			if (!(event.keyCode >=37 && event.keyCode<=40)) {
				var inputVal = $(this).val();
				$(this).val(inputVal.replace(/[^a-z0-9]/gi,''));
			}
		}).on("keyup", function() {
			if (!(event.keyCode >=37 && event.keyCode<=40)) {
				var inputVal = $(this).val();
				$(this).val(inputVal.replace(/[^a-z0-9]/gi,''));
			}
	});
</script>