摘要： #nav{list-style-type:none;font-size:14px;}#nava{display:block;text-align:center;}#nava:link{text-decoration:none;}#nava:visited{text-decoration:none;}#nava:hover{text-decoration:none;}#navli{float:left;}#navlia:hover{}#navliul{top:149px;list-style-type:none;text-align:left;left:-999em;width:180px;po 阅读全文