https://blog.youkuaiyun.com/student4javazh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/student4java/article/details/6065384https://blog.youkuaiyun.com/student4java/article/details/6065384student4javaThu, 09 Dec 2010 13:58:00 +08001.关于介绍 ：以下为最好的演示地址：http://www.w3school.com.cn/tiy/t.asp?f=hdom_table_paddspac
为防止演示地址无效 加上演示代码