Non-regular implementation of an input box that can only input Chinese characters_javascript skills

//* <form name="frm"> <p>An input box that can only input Chinese characters <input onkeypress="onlychinese() " name="test"><input type="button" value="只能输入中文" name="submit" onclick="javascript:ALERT('谢谢您的访问!')"> </p> </form> *//
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> function onlychinese() { if ((window.event.keyCode >=32) && (window.event.keyCode <= 126)) { window.event.keyCode = 0 ; } } </script>