css3渐变 transition使用方法
<style> div{ width:300px; height:300px; background:#89F; margin:100px auto; transition:width 1s ease-out .5s; -moz-transition:width 1s ease-out .5s; -webkit-transition:width 1s ease-out .5s; -o-transition:width 1s ease-out .5s; } div:hover{ width:600px; } </style> <div></div>