如何用CSS3实现鼠标悬停效果
本文给大家介绍下不需要任何javascript代码，仅使用纯CSS3和HTML实现鼠标悬停的超酷效果，鼠标在悬停目标元素上的时候可以实现常见的线条变化、翻转、缩放、滑动等等动画效果。
HTML
我们在.he_border1里放置一张图片，以及图片说明信息。
CSS
我们要实现的效果是，当鼠标放到图片上时，图片放大，图片上方将出现一个带透明度的遮罩层，并且出现四条线框变化动画，最终四条线框闭合成方形，在方形里显示图片说明文字。这种效果在很多图片站、以及产品列表页应用非常广泛。
.he_border1{background:#fe7253;width:360px;height:240px;padding:0;margin:0;border:1px solid #000;position:relative;box-sizing:border-box;-webkit-transition:all .4s ease-in-out;-moz-transition:all .4s ease-in-out;-o-transition:all .4s ease-in-out;-ms-transition:all .4s ease-in-out;transition:all .4s ease-in-out;overflow:hidden}
.he_border1 .he_border1_img{display:block;width:100%;padding:0;margin:0;position:relative;-webkit-transition:all .4s ease-in-out;-moz-transition:all .4s ease-in-out;-o-transition:all .4s ease-in-out;-ms-transition:all .4s ease-in-out;transition:all .4s ease-in-out;opacity:1;overflow:hidden}
.he_border1:hover .he_border1_img{position:absolute;-webkit-transform:scale(1.1);-moz-transform:scale(1.1);-o-transform:scale(1.1);-ms-transform:scale(1.1);transform:scale(1.1);opacity:.6}
.he_border1 .he_border1_caption{color:#fff;padding:0;margin:0;-moz-backface-visibility:hidden;-webkit-backface-visibility:hidden;backface-visibility:hidden;-webkit-transition:all .4s ease-in-out;-moz-transition:all .4s ease-in-out;-o-transition:all .4s ease-in-out;-ms-transition:all .4s ease-in-out;transition:all .4s ease-in-out;overflow:hidden}
.he_border1 .he_border1_caption::before,.he_border1 .he_border1_caption::after{position:absolute;content:'';opacity:0;-webkit-transition:opacity 0.4s,-webkit-transform .4s;-moz-transition:opacity 0.4s,-moz-transform .4s;-o-transition:opacity 0.4s,-o-transform .4s;transition:opacity 0.4s,transform .4s}
.he_border1 .he_border1_caption::before{top:8%;right:10%;bottom:8%;left:10%;border-top:1px solid #fff;border-bottom:1px solid #fff;-webkit-transform:scale(0,1);-moz-transform:scale(0,1);-o-transform:scale(0,1);transform:scale(0,1);-webkit-transform-origin:0 0;-moz-transform-origin:0 0;-o-transform-origin:0 0;transform-origin:0 0}
.he_border1 .he_border1_caption::after{top:8%;right:10%;bottom:8%;left:10%;border-right:1px solid #fff;border-left:1px solid #fff;-webkit-transform:scale(1,0);-moz-transform:scale(1,0);-o-transform:scale(1,0);transform:scale(1,0);-webkit-transform-origin:100% 0;-moz-transform-origin:100% 0;-o-transform-origin:100% 0;transform-origin:100% 0}
.he_border1:hover .he_border1_caption::before,.he_border1:hover .he_border1_caption::after{opacity:1;-webkit-transform:scale(1);-moz-transform:scale(1);-o-transform:scale(1);transform:scale(1)}
.he_border1 .he_border1_caption,.he_border1 .he_border1_caption > a{position:absolute;top:0;left:0;width:100%;height:100%;-webkit-transition:all .4s ease-in-out;-moz-transition:all .4s ease-in-out;-o-transition:all .4s ease-in-out;-ms-transition:all .4s ease-in-out;transition:all .4s ease-in-out;overflow:hidden; z-index:1000}
.he_border1 .he_border1_caption_h{font-size:1.3em;font-weight:700;text-align:center;width:80%;position:absolute;top:20%;left:10%;-webkit-transition:all .5s ease-in-out;-moz-transition:all .5s ease-in-out;-o-transition:all .5s ease-in-out;-ms-transition:all .5s ease-in-out;transition:all .5s ease-in-out;overflow:hidden;opacity:1}
.he_border1 .he_border1_caption_p{font-size:1em;text-align:center;width:80%;position:absolute;top:60%;left:10%;-webkit-transition:all .4s ease-in-out;-moz-transition:all .4s ease-in-out;-o-transition:all .4s ease-in-out;-ms-transition:all .4s ease-in-out;transition:all .4s ease-in-out;overflow:hidden;opacity:0}
.he_border1:hover .he_border1_caption_p{top:45%;opacity:1}
以上代码充分利用了CSS3的动画属性transform的使用，将鼠标悬停动画效果展现出来。欢迎查看演示DEMO更多的鼠标悬停效果：缩放、翻转、滑动等等。