其实css3有两种方慕蛋辉式实现这个效果：近满 1. css3 过度transition.class{position:relative;-webkit-transition:;top;10s;linear;;/*top;时间（用秒计算）s;linear;*/-moz-transition:;top;10s;linear;-o-transition:;top;10s;linear;transition:;top;10s;linear;}.class:hover{top:100px;}详见：http://www.w3school.com.cn/css3/css3_transition.asp 2. css3 动画animation@-webkit-keyframes;myfirst{from;{top:;0;}to;{top:;100px;}}@-moz-keyframes;myfirst{from;{top:;0;}to;{top:;100px;}}@-o-keyframes;myfirst{from;{top:;0;}to;{top:;100px;}}@keyframes;myfirst{from;{top:;0;}to;{top:;100px;}}.class{position:relative;}.class:hover{-webkit-animation:myfirst;10s;-moz-animation:myfirst;10s;-o-animation:myfirst;10s;animation:myfirst;10s;}详丰菠见：http://www.w3school.com.cn/css3/css3_animation.asp