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：
>
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> <p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p> <p><img src="https://img.php.cn/upload/article/000/000/194/b3be7856fbb7a7910df5b5d97fb25abf-0.jpg" alt=""></p><div class="aritcle_card flexRow"> <div class="artcardd flexRow"> <a class="aritcle_card_img" href="/ai/1185" title="DALL·E 2"><img src="https://img.php.cn/upload/ai_manual/001/431/639/68b7aed28a561294.png" alt="DALL·E 2"></a> <div class="aritcle_card_info flexColumn"> <a href="/ai/1185" title="DALL·E 2">DALL·E 2</a> <p>OpenAI基于GPT-3模型开发的AI绘图生成工具，可以根据自然语言的描述创建逼真的图像和艺术。</p> </div> <a href="/ai/1185" title="DALL·E 2" class="aritcle_card_btn flexRow flexcenter"><b></b><span>下载</span> </a> </div> </div> <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> <div class="artmoreart "> <div class="artdp artptit"><span></span> <p>相关文章</p> </div> <div class="artmores flexColumn"> <a class="artmrlis flexRow" href="/faq/2032705.html" title="css 想让网格容器自适应屏幕宽度怎么办_width 100% 配合 display grid"><b></b> <p class="overflowclass">css 想让网格容器自适应屏幕宽度怎么办_width 100% 配合 display grid</p> </a> <a class="artmrlis flexRow" href="/faq/2032280.html" title="css 初级项目中边框样式杂乱怎么办_通过统一边框规范解决"><b></b> <p class="overflowclass">css 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