纯css图切换 练习 教程来自snwebsite a{ display:block; border:1px solid #cccccc; width:20px; height:20px; margin:1px; } dl{ position:absolute; width:240px; height:170px; } dt{ position:absolute; right:1px; top:25px; } dd{ width:240px; height:170px; overflow:hidden; }