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纯css 圆角实现代码
简介html 复制代码代码如下:
html
复制代码代码如下:
<div class="curvedBox">
<span>
<span class="r1" ></span>
<span class="r2" ></span>
<span class="r3" ></span>
<span class="r4" ></span>
</span>
<div class="content">
Flex is a cross-platform development framework for creating rich Internet applications (RIAs). Flex enables you to create expressive, high-performance applications that run identically on all major browsers and operating systems.
</div>
<span>
<span class="r4" ></span>
<span class="r3" ></span>
<span class="r2" ></span>
<span class="r1" ></span>
</span>
</div>
css
复制代码代码如下:
body{background-color:#000;}
.curvedBox{width:300px;margin: 2510px auto 0;}
.curvedBox .r1,.curvedBox .r2,.curvedBox .r3,.curvedBox .r4{background-color:#fff;display:block;overflow:hidden;height:1px;font-size:1px;}
.curvedBox .r2,.curvedBox .r3,.curvedBox .r4{border-width:0 1px;border-left:1px solid #fff;border-right:1px solid #fff;}
.curvedBox .r1{margin:0 6px;}
.curvedBox .r2{margin:0 3px;}
.curvedBox .r3{margin:0 2px;}
.curvedBox .r4{margin:0 1px;height:2px;}
.curvedBox .content{background:#fff;border-left:1px solid #fff;border-right:1px solid #fff;padding:0 5px;}
复制代码代码如下:
<div class="curvedBox">
<span>
<span class="r1" ></span>
<span class="r2" ></span>
<span class="r3" ></span>
<span class="r4" ></span>
</span>
<div class="content">
Flex is a cross-platform development framework for creating rich Internet applications (RIAs). Flex enables you to create expressive, high-performance applications that run identically on all major browsers and operating systems.
</div>
<span>
<span class="r4" ></span>
<span class="r3" ></span>
<span class="r2" ></span>
<span class="r1" ></span>
</span>
</div>
css
复制代码代码如下:
body{background-color:#000;}
.curvedBox{width:300px;margin: 2510px auto 0;}
.curvedBox .r1,.curvedBox .r2,.curvedBox .r3,.curvedBox .r4{background-color:#fff;display:block;overflow:hidden;height:1px;font-size:1px;}
.curvedBox .r2,.curvedBox .r3,.curvedBox .r4{border-width:0 1px;border-left:1px solid #fff;border-right:1px solid #fff;}
.curvedBox .r1{margin:0 6px;}
.curvedBox .r2{margin:0 3px;}
.curvedBox .r3{margin:0 2px;}
.curvedBox .r4{margin:0 1px;height:2px;}
.curvedBox .content{background:#fff;border-left:1px solid #fff;border-right:1px solid #fff;padding:0 5px;}
这个方法其实并不完美,其实只是利用了”无限接近”的一个概念。看放大后的图的话,可以很清楚地看到锯齿状。
锯齿
其实把图片放大足够地倍数地话,也能看到锯齿,不过放大地倍数得相当大了。将 r1 r2 r3 r4 层叠起来,利用它们 margin(left/right) 的改变以及 border(left/right),来实现这个近似的效果。理论上,如果 rn 足够多的话,效果就会无限趋近圆弧。不过话又说回来了,多加这么多的标签和css的话,在效率上必然会存在问题,也说不上就比用图片好到哪里去。所以说,这只是提供一个思路,到底怎么用,用在哪里,还得因地制宜。
不过有第一点其实应该注意的 rn{;overflow:hidden;} 这是解决 ie 下1像素高容器的方法,ie 下当容器高度低于某些值时(如10px),即使指定
height:1px; 得到的表现都会远高于1px,而 overflow:hidden; 是一个很好的解决方法。
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