1.border-radius:边框圆角
2.border-shadow:边框阴影
3.border-image:边框背景图片
使用方法：
1.边圆角
div{
border:2px solid red;
border-radius:10px;
}
2.边框阴影
div{
box-shadow:10px 10px 5px #000frg;
}
3.边框背景图片
div{
border-image:url(border.png) 30 30 round;
-moz-border-image:url(border.png) 30 30 round;
-webkit-border-image:url(border.png) 30 30 round;
-o-border-image:url(border.png) 30 30 round;
}