Web Front-endCSS TutorialHow to create a border shadow effect using the box-shadow property of CSS3How to create a border shadow effect using the box-shadow property of CSS3
这篇文章主要介绍了CSS3的box-shadow属性制作边框阴影效果的方法,box-shadow属性还是十分强大的,能设定阴影的水平或垂直位置,以及阴影的颜色和尺寸等,需要的朋友可以参考下
效果演示：
box-shadow向框添加一个或多个阴影。IE9+、Firefox 4、Chrome、Opera 以及 Safari 5.1.1 支持 box-shadow 属性。
语法：
代码如下:
box-shadow: h-shadow v-shadow blur spread color inset;
h-shadow,v-shadow必须。水平，垂直阴影的位置。允许赋值。blur可选，模糊距离。spread可选，阴影的尺寸。color可选，阴影的颜色。inset可选，将外部阴影（outset）改为内部阴影。
来看几个简单的范例：
<body> <p class="box"> <span class="caption">A</span> </p> <p class="box"> <span class="caption">B</span> </p> <p class="box"> <span class="caption">C</span> </p> <p class="box"> <span class="caption">D</span> </p> <p class="box"> <span class="caption">E</span> </p> <p class="box"> <span class="caption">F</span> </p> <p class="box"> <span class="caption">G</span> </p> <p class="box"> <span class="caption">H</span> </p> </body>
先将它们简单的设定一下样式：
.box {
background-color: #fff;
border: 3px solid #ccc;
float: left;
margin: 20px 40px 0 0;
height: 65px;
width: 160px;
text-align: center;
}
.caption {
font-size: 20px;
position: relative;
top: 20px;
}接着就一一来练习一下各种参数的使用方式。基本上使用 box-shadow 时最少得要提供 h-shadow 及 v-shadow 两个参数：
.box:nth-child(1) {
-webkit-box-shadow: 3px 3px #f3d42e;
-moz-box-shadow: 3px 3px #f3d42e;
box-shadow: 3px 3px #f3d42e;
}若位移距离为正值时就是往右或往下偏移；反之则往左或往上
再加上 5px 的模糊半径：
.box:nth-child(2) {
-webkit-box-shadow: 3px 3px 5px #f3d42e;
-moz-box-shadow: 3px 3px 5px #f3d42e;
box-shadow: 3px 3px 5px #f3d42e;
}
扩散距离会加强实际的阴影的范围：
.box:nth-child(3) {
-webkit-box-shadow: 3px 3px 0 5px #f3d42e;
-moz-box-shadow: 3px 3px 0 5px #f3d42e;
box-shadow: 3px 3px 0 5px #f3d42e;
}位移的距离会在加上扩散距离，所以若值为负的会减少阴影的范围
扩散出来的部份也会套上模糊的效果：
.box:nth-child(4) {
-webkit-box-shadow: 3px 3px 5px 5px #f3d42e;
-moz-box-shadow: 3px 3px 5px 5px #f3d42e;
box-shadow: 3px 3px 5px 5px #f3d42e;
}
如果没有设定位移距离的话，那么模糊的效果就会直接从区块周围露出：
.box:nth-child(5) {
-webkit-box-shadow: 0 0 15px #f3d42e;
-moz-box-shadow: 0 0 15px #f3d42e;
box-shadow: 0 0 15px #f3d42e;
}
再加上扩散距离：
.box:nth-child(6) {
-webkit-box-shadow: 0 0 15px 5px #f3d42e;
-moz-box-shadow: 0 0 15px 5px #f3d42e;
box-shadow: 0 0 15px 5px #f3d42e;
}
另外，若在使用时加上 inset 参数的话，则原本显示在区块外的阴影效果就会变成是内阴影的效果了：
.box:nth-child(7) {
-webkit-box-shadow: 3px 3px #f3d42e inset;
-moz-box-shadow: 3px 3px #f3d42e inset;
box-shadow: 3px 3px #f3d42e inset;
}有仔细注意到吗？本来位移距离为正值时就是往右或往下偏移，但因为加上 inset 参数，所以效果就反过来了：
加上模糊半径及扩散距离：
.box:nth-child(8) {
-webkit-box-shadow: 3px 3px 5px 5px #f3d42e inset;
-moz-box-shadow: 3px 3px 5px 5px #f3d42e inset;
box-shadow: 3px 3px 5px 5px #f3d42e inset;
}
在元素上加了多组阴影设定的话：
.box:nth-child(9) {
-webkit-box-shadow: 13px 13px #f3d42e, -10px 10px #33d42e, -5px -10px #ff0d2d, 10px -8px #034d5e;
-moz-box-shadow: 13px 13px #f3d42e, -10px 10px #33d42e, -5px -10px #ff0d2d, 10px -8px #034d5e;
box-shadow: 13px 13px #f3d42e, -10px 10px #33d42e, -5px -10px #ff0d2d, 10px -8px #034d5e;
}阴影的阶层关系是越先设定的阶层会越高~
当熟悉 box-shadow 的用法时，就能很简单又快速的将各种元素加上更有设计感的边框效果唷！
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