重复径向渐变 | repeating-radial-gradient() (Image Values) - CSS 中文开发手册
repeating-radial-gradient()创建一个由重复的梯度从原点辐射的<image>。它类似于radial-gradient(), 并采取相同的参数, 但它重复的颜色停止无限在所有方向, 以覆盖其整个容器。函数的结果是<gradient>数据类型的一个对象,这是一种特殊的类型<image>。
/* A repeating gradient at the center of its container, starting red, changing to blue, and finishing green */ repeating-radial-gradient(circle at center, red 0, blue, green 30px);
每重复一次,彩色光圈的位置偏移基本径向梯度的尺寸(最后一个彩色光圈和第一个颜色光圈之间的距离)的倍数。因此,每个结束彩色停止的位置与起始彩色停止一致; 如果颜色值不同,这将导致一个清晰的视觉过渡。
与任何梯度一样,重复的径向梯度具有没有内在维度也就是说,它没有自然的或优先的大小,也没有优先的比率。它的具体大小将与它所应用的元素的大小相匹配。
使用说明:由于<gradient>属于<image>数据类型,因此只能在可以使用<image>的地方使用。出于这个原因,repeating-radial-gradient()将不能在background-color其他使用<color>数据类型的属性上工作。
句法
取值
<position>渐变的位置,以与background-position或相同的方式解释transform-origin。如果未指定,则默认为center。<angle>渐变线的角度,从此角度的起点延伸。如果未指定,则默认为0deg。<shape>渐变的形状。值可以是circle(意思是渐变的形状是一个具有恒定半径的圆)或ellipse(意思是该形状是一个轴对齐的椭圆)。如果未指定,则默认为ellipse。<extent-keyword>描述结尾形状必须有多大的关键字。可能的值是:
Keyword | Description |
---|---|
closest-side | The gradient‘s ending shape meets the side of the box closest to its center (for circles) or meets both the vertical and horizontal sides closest to the center (for ellipses). |
closest-corner | The gradient‘s ending shape is sized so that it exactly meets the closest corner of the box from its center. |
farthest-side | Similar to closest-side, except the ending shape is sized to meet the side of the box farthest from its center (or vertical and horizontal sides). |
farthest-corner | The gradient‘s ending shape is sized so that it exactly meets the farthest corner of the box from its center. |
注意:此函数的早期实现包括其他关键字(cover和contain)作为标准的同义词farthest-corner和closest-side分别。仅使用标准关键字,因为某些实现已经删除了这些旧的变体。
<color-stop>一个颜色停止的<color>值,后跟一个可选的停止位置(<percentage>或<length>沿着渐变轴)。百分比0%或长度0代表渐变的中心; 该值100%表示结束形状与虚拟梯度射线的交集。两者之间的百分比值线性定位在梯度射线上。
形式语法
repeating-radial-gradient( [[ circle || <length> ] [at <position>]? , | [ ellipse || [<length> | <percentage> ]{2}] [at <position>]? , | [[ circle | ellipse ] || <extent-keyword> ] [at <position>]? , | at <position> , <color-stop> [ , <color-stop> ]+ ) \---------------------------------------------------------------/\--------------------------------/ Contour, size and position of the ending shape List of color stops where <extent-keyword> = closest-corner | closest-side | farthest-corner | farthest-side and <color-stop> = <color> [ <percentage> | <length> ]?
实例
径向梯度沿轴运动。在轴的每个端点,指定一个半径。这可以想象为创建两个“圆”,其中每个圆的中心由点指定,半径由半径长度指定。梯度从内圆的圆周向外圆的圆周向外延伸。
黑白梯度
<div id="grad1">Black white</div>
div { display: block; width: 50%; height: 80px; border-color: #000000; padding: 10px; } #grad1 { background: -webkit-repeating-radial-gradient(black, black 5px, white 5px, white 10px); background: -moz-repeating-radial-gradient(black, black 5px, white 5px, white 10px); background: -ms-repeating-radial-gradient(black, black 5px, white 5px, white 10px); background: -o-repeating-radial-gradient(black, black 5px, white 5px, white 10px); background: repeating-radial-gradient(black, black 5px, white 5px, white 10px); text-shadow: 1px 1px 0pt black; color: white; border: 1px solid black; height:5.5em; }
background: repeating-radial-gradient(black, black 5px, white 5px, white 10px);
最远角
<div id="grad1">Farthest-corner</div>
div { display: block; width: 50%; height: 80px; border-radius: 10px; border-color: #000000; padding: 10px; } #grad1 { background: -webkit-repeating-radial-gradient(ellipse farthest-corner, red, black 5%, blue 5%, green 10%); background: -moz-repeating-radial-gradient(ellipse farthest-corner, red, black 5%, blue 5%, green 10%); background: -ms-repeating-radial-gradient(ellipse farthest-corner, red, black 5%, blue 5%, green 10%); background: -o-repeating-radial-gradient(ellipse farthest-corner, red, black 5%, blue 5%, green 10%); background: repeating-radial-gradient(ellipse farthest-corner, red, black 5%, blue 5%, green 10%); text-shadow: 1px 1px 0pt blue; color: white; border: 1px solid black; height:5.5em; }
background: repeating-radial-gradient(ellipse farthest-corner, red, black 5%, blue 5%, green 10%);
规格
Specification | Status | Comment |
---|---|---|
CSS Image Values and Replaced Content Module Level 3The definition of ‘repeating-radial-gradient()‘ in that specification. | Candidate Recommendation | Initial definition. |
浏览器兼容性
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support (on background and background-image) | 10 -webkit | 3.6 (1.9.2)-moz 16 (16)1 | 10 | 12 -o 12.5 | 5.1 -webkit |
On border-image | (Yes) | 29 (29) | (Yes) | (Yes) | (Yes) |
On any other property that accept <image> | No support | (Yes) | (Yes) | (Yes) | (Yes) |
Interpolation hints (a percent without a color) | 40 | 36 (36) | ? | ? | ? |
Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
Basic support (on background and background-image) | 4.4 | 46.0 (46) | 10 | 12.1 | 7.1 |
On border-image | 29.0 (29) | (Yes) | (Yes) | (Yes) | (Yes) |
On any other property that accept <image> | No support | (Yes) | (Yes) | (Yes) | (Yes) |
重复径向渐变 | repeating-radial-gradient() (Image Values) - CSS 中文开发手册 - Break易站