CSS | 边界半径属性 (CSS | border-radius Property)
The border-radius property is commonly used to convert box elements into circles. We can convert box elements into the circle element by setting the border-radius to half of the length of a square element.
border-radius属性通常用于将框元素转换为圆形。 通过将边框半径设置为正方形元素长度的一半，我们可以将框元素转换为圆形元素。
Syntax:
句法：
Element {
Width: 150px;
Height: 150px;
border-radius: 50%;
}
Example:
例：
<!DOCTYPE html>
<html>
<head>
<style>
p {
background: #73AD21;
width: 200px;
height: 150px;
border-radius: 50%
}
</style>
</head>
<body>
<h1>CSS Rounded Corners</h1>
<p></p>
</body>
</html>
Output
输出量
In the above example, 50% border-radius is applied to all the corners.
在上面的示例中，将50％的边界半径应用于所有角。
1)具有一个值的border-radius属性 (1) border-radius property with one value)
The property takes a single value to the border-radius and that value is applied to all the four corners and the corners are rounded equally.
该属性对边界半径采用单个值，并且该值应用于所有四个角，并且这些角均等地舍入。
Syntax:
句法：
Element {
border-radius: 15px;
}
Example:
例：
<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 2px solid red;
padding: 10px;
border-radius: 25px;
}
</style>
</head>
<body>
<div>
<p>Border Radius in CSS</p>
</div>
</body>
</html>
Output
输出量
In the above example, the border-radius of 25px is applied to all four sides equally.
在上面的示例中， 边界半径 25px均等地应用于所有四个侧面。
2)具有两个值的border-radius属性 (2) border-radius property with two values)
This property takes two values to the border-radius. The first value is applied to top-left and bottom-right corners, the second value is applied to top-right and bottom-left corners.
此属性将border-radius取两个值。 第一个值应用于左上角和右下角 ，第二个值应用于右上角和左下角 。
Syntax:
句法：
Element {
border-radius: 15px 10px;
}
Example:
例：
<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 2px solid red;
padding: 10px;
border-radius: 60px 30px;
}
</style>
</head>
<body>
<div>
<p>Border Radius in CSS</p>
</div>
</body>
</html>
Output
输出量
In the above example, the border-radius of 60px is applied to top-left and bottom-right and 30px is applied to top-right and bottom-left corners.
在上面的示例中， 边框半径 60px应用于左上角和右下角，而30px应用于右上角和左下角 。
3)具有三个值的border-radius属性 (3) border-radius property with three values)
This property takes three values to the border-radius. The first value is applied to the top-left corner and the second value is applied to top-right and bottom-left corners, and the third value is applied to the bottom-right corner.
该属性将border-radius取三个值。 所述第一值被施加到左上角和所述第二值被施加到右上和左下的角，并且所述第三值被施加到右下角 。
Syntax:
句法：
Element {
border-radius: 15px 10px 30px;
}
Example:
例：
<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 2px solid green;
padding: 10px;
border-radius: 60px 30px 20px;
}
</style>
</head>
<body>
<div>
<p>Border Radius in CSS</p>
</div>
</body>
</html>
Output
输出量
In the above example, border-radius of 60px is applied to top-left corner, 30px is applied to top-right and bottom-left corners and 20px is applied to bottom-right corner.
在上面的例子中，60像素 边界半径被施加到左上角 ，30像素被施加到右上和左下的角和20像素被施加到右下角 。
4)具有四个值的border-radius属性 (4) border-radius property with four values)
This property takes four values to the border-radius and applies four different values to each of the corners. The first value is applied to the top-left corner, the second value is applied to the top-right corner, the third value is applied to the bottom-right corner and the fourth value is applied to the bottom-left corner.
此属性将四个值应用于边界半径 ，并将四个不同的值应用于每个角。 所述第一值被施加到左上角 ，第二值被施加到右上角 ，第三值被施加到右下角和第四值被施加到左下角 。
Syntax:
句法：
Element {
border-radius: 15px 10px 20px 5px;
}
Example:
例：
<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 2px solid green;
padding: 10px;
border-radius: 60px 30px 50px 10px;
}
</style>
</head>
<body>
<div>
<p>Border Radius in CSS</p>
</div>
</body>
</html>
Output
输出量
In the above example, 60px is applied to top-left corner, 30px is applied to the top-right corner, 50px is applied to bottom-right corner and 10px is applied to bottom-left corner of the box.
在上述例子中，60像素被施加到左上角 ，30像素被施加到右上角 ，50像素被施加到右下角和10px的被施加到盒的左下角 。
翻译自: https://www.includehelp.com/code-snippets/the-border-radius-property-in-css.aspx
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