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How to create a border shadow effect using the box-shadow property of CSS3

高洛峰
高洛峰Original
2017-03-13 17:59:242727browse

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:
How to create a border shadow effect using the box-shadow property of CSS3

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
How to create a border shadow effect using the box-shadow property of CSS3

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;   
}

How to create a border shadow effect using the box-shadow property of CSS3

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
How to create a border shadow effect using the box-shadow property of CSS3

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;   
}


How to create a border shadow effect using the box-shadow property of CSS3

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;   
}


How to create a border shadow effect using the box-shadow property of CSS3

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;   
}


How to create a border shadow effect using the box-shadow property of CSS3

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:
How to create a border shadow effect using the box-shadow property of CSS3

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;   
}


How to create a border shadow effect using the box-shadow property of CSS3

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~
How to create a border shadow effect using the box-shadow property of CSS3

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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