讓checkbox、radio "唯讀"狀態

http://betray.pixnet.net/blog/post/24264932-%E9%80%9A%E9%80%9A%E4%B8%8D%E5%87%86%E5%8B%95%EF%BC%8C%E8%AE%93checkbox%E3%80%81radio%E9%81%94%E5%88%B0readonly