67 lines
3.0 KiB
Markdown
67 lines
3.0 KiB
Markdown
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---
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title: CSS3 Border Radius Property
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localeTitle: CSS3 Border Radius属性
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---
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## CSS3 Border Radius属性
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使用CSS3，您可以使用`border-radius`属性为任何元素提供“圆角”。该值可以是任何有效的CSS长度单位。
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```css
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.rounded-corners {
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border-radius: 20px;
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}
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.circle {
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border-radius: 50%;
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}
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```
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**注意：** `border-radius`属性实际上是`border-top-left-radius` ， `border-top-right-radius` ， `border-bottom-right-radius`和`border-bottom-left-radius`属性的简写属性。
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如果只提供一个值，则所有四个角的border-radius将相同，如上例所示。但您也可以选择为每个角指定不同的值。
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```css
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.new-shape {
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border-radius: 20px 50px 5px 0; /* top left, top right, bottom right, bottom left */
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}
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```
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如果仅提供两个值，则第一个值适用于左上角和右下角，第二个值适用于右上角和左下角。
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```css
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.leaf-shape {
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border-radius: 0 50%;
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}
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```
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如果设置了三个值，则第一个值再次应用于左上半径，第二个值指示右上角和左下角，留下第三个值以指示右下角。
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```css
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.odd-shape {
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border-radius: 0 20px 50%;
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}
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```
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拐角的圆角不必完全对称。您可以使用斜杠（“/”）指定水平和垂直半径，以获得具有椭圆形状的角。 \`\`\`CSS .elliptical-1 { border-radius：50px / 10px; / \*水平半径/垂直半径\* / } .elliptical-2 { border-radius：10px / 50px; }
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```
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Since only one pair of values is given in the above examples, all four corners are the same. But, of course, if you want a more complex shape, you may supply up to four values for the horizontal radiuses and four for the vertical radiuses.
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```
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CSS .elliptical-3 { border-radius：50px 20px 50px 20px / 20px 50px 20px 50px; / \*水平左上，水平右上，水平右下，水平左下/垂直左上，垂直右上，垂直右下，垂直左下\* / }
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```
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Notice how the shorthand above produces the same result as specifying individual properties below. Be aware that when corners are set individually the values are space-separated instead of slash-separated.
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```
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CSS .elliptical-4 { border-top-left-radius：50px 20px; / \*水平半径，垂直半径\* / border-top-right-radius：20px 50px; border-bottom-right-radius：50px 20px; border-bottom-left-radius：20px 50px; } \`\`\` 
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### 更多信息：
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* CSS技巧： [CSS技巧](https://css-tricks.com/almanac/properties/b/border-radius/)
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* MDN文档： [MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius)
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* 浏览器支持： [caniuse](http://caniuse.com/#search=border-radius)
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