<style>
div{width:100px; height: 100px; position: relative; background: yellow;}
span{width: 100px; height: 100px;position: absolute;
top:-100px;left: 0;background: red;}
</style>
<script>
</script>
<div>
<span></span>
</div>
怎样写jQuery能让鼠标进入div时,span匀速从上往下完全覆盖,移开时能从当前所到达的位置匀速从下往上
李钟正
慕斯卡8036547