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CSS3之box-shadow属性使用以及单边阴影效果设置

黄舟

黄舟

发布时间:2017-07-21 14:09:45

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4488人浏览过

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来源于php中文网

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3.5.2 box-shadow属性使用方法(1)

和PSD软件制作图片相比,box-shadow修改元素的阴影效果要方便得多,因为box-shadow可以修改六个参数,得到不同的效果。下面结合一些简单的案例来对box-shadow属性进行演示说明。

1.单边阴影效果

定义元素的单边阴影效果和调协border的单边边框颜色是相似的,例如:

  1. > 
     
     
       
      box-shadow设置单边阴影效果title> 
      <style type="text/css"> 
        .box-shadow {  
          width: 200px;  
          height: 100px;  
          border-radius: 5px;  
          border: 1px solid #ccc;  
          margin: 20px;  
        }  
        .top {  
          box-shadow: 0 -2px 0 red;  
        }  
        .right {  
          box-shadow: 2px 0 0 green;  
        }  
        .bottom {  
          box-shadow: 0 2px 0 blue;  
        }  
        .left {  
          box-shadow: -2px 0 0 orange;  
        }  
      style> 
    head> 
    <body> 
      <p class="box-shadow top">p> 
      <p class="box-shadow right">p> 
      <p class="box-shadow bottom">p> 
      <p class="box-shadow left">p> 
    body> 
    html></pre></li></ol>
    <p>效果如图3-38所示。</p>
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    <p>这个案例中,使用box-shadow给元素设置了顶边、右边、底边和左边的单边阴影效果。主要通过box-shadow的水平和垂直阴影的偏移量 来实现,其中x-offset为正值时,生成右边阴影,反之为负值时,生成左边阴影;y-offset为正值时,生成底部阴影,反之为负值时生成顶部阴 影。此例中是一个单边实影投影效果(阴影模糊半径为0),但是如果阴影的模糊半径不是0,上面的方法还能不能实现单边阴影效果呢?不急着来回答,在上面的 实例中添加一个模糊半径,例如:</p>
    <ol class="dp-xml list-paddingleft-2"><li><pre class="brush:html;toolbar:false">.top {  
          box-shadow: 0 -2px 5px red;  
        }  
        .right {  
          box-shadow: 2px 0 5px green;  
        }  
        .bottom {  
          box-shadow: 0 2px 5px blue;  
        }  
        .left {  
          box-shadow: -2px 0 5px orange;  
        }</pre></li></ol>
    <p>图3-39说明,这个效果并不是理想的单边阴影效果,当box-shadow添加了5px阴影模糊半径后,阴影不再是实影投影,阴影清晰度向外扩散,更具阴影的效果。但造成了另一个问题,给元素其他三个边加上淡淡的阴影效果,可这并不是设计需要的效果。</p>
    <p>那究竟要怎么做呢?此时,box-shadow属性中的阴影扩展半径(spread-radius)会是一个很关键的属性,要实现单边阴影效果,必须配上这个属性(除单边实影之外)。</p>
    <p><img src="https://img.php.cn/upload/article/000/000/194/d2d2682db4b8ff1b96fa91fca2e2afed-1.jpg" alt=""></p>
    <ol class="dp-xml list-paddingleft-2"><li><pre class="brush:html;toolbar:false">.top {  
          box-shadow: 0 -4px 5px -3px red;  
        }  
        .right {  
          box-shadow: 4px 0 5px -3px green;  
        }  
        .bottom {  
          box-shadow: 0 4px 5px -3px blue;  
        }  
        .left {  
          box-shadow: -4px 0 5px -3px orange;  
        }</pre></li></ol>
    <p>上面的代码调整了阴影的位移量,新增了box-shadow的扩展半径,</p>					</div>
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