只能輸入中文
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>只能輸入中文</title>
</head>
<body>
<input type="text" id="text" onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))">
</body>
</html>
