ground-repeatCSS 属性定义背景图像的重复方式。背景图像可以沿着水平轴，垂直轴，两个轴重复，或者根本不重复。
/* One-value syntax */ background-repeat: repeat-x; background-repeat: repeat-y; background-repeat: repeat; background-repeat: space; background-repeat: round; background-repeat: no-repeat; /* Two-value syntax: horizontal | vertical */ background-repeat: repeat space; background-repeat: repeat repeat; background-repeat: round space; background-repeat: no-repeat round; /* Global values */ background-repeat: inherit; background-repeat: initial; background-repeat: unset;
默认情况下，重复的图像被裁剪为元素的大小，但可以缩放以适合（使用round）或者从头到尾均匀分布（使用space）。
|
初始值 |
repeat |
|---|---|
|
适用元素 |
all elements. It also applies to ::first-letter and ::first-line. |
|
是否是继承属性 |
no |
|
适用媒体 |
visual |
|
计算值 |
a list, each item consisting of two keywords, one per dimension |
|
Animation type |
discrete |
|
正规顺序 |
the unique non-ambiguous order defined by the formal grammar |
语法
值
<repeat-style>单值语法是完整的双值语法的缩写：
|
单值 |
等价于双值 |
|---|---|
|
repeat-x |
repeat no-repeat |
|
repeat-y |
no-repeat repeat |
|
repeat |
repeat repeat |
|
space |
space space |
|
round |
round round |
|
no-repeat |
no-repeat no-repeat |
在双值语法中, 第一个值表示水平重复行为, 第二个值表示垂直重复行为. 下面是关于每一个值是怎么工作的具体说明:
|
repeat |
图像会按需重复来覆盖整个背景图片所在的区域. 最后一个图像会被裁剪, 如果它的大小不合适的话. |
|---|---|
|
space |
图像会尽可能得重复, 但是不会裁剪. 第一个和最后一个图像会被固定在元素(element)的相应的边上, 同时空白会均匀地分布在图像之间. |
|
round |
随着允许的空间在尺寸上的增长, 被重复的图像将会伸展(没有空隙), 直到有足够的空间来添加一个图像. 当下一个图像被添加后, 所有的当前的图像会被压缩来腾出空间. 例如, 一个图像原始大小是260px, 重复三次之后, 可能会被伸展到300px, 直到另一个图像被加进来. 这样他们就可能被压缩到225px. |
|
no-repeat |
图像不会被重复(因为背景图像所在的区域将可能没有完全被覆盖). 那个没有被重复的背景图像的位置是由 |
正式语法
<repeat-style>#where <repeat-style> = repeat-x | repeat-y | [ repeat | space | round | no-repeat ]{1,2}
示例
HTML
<ol> <li>no-repeat <div class="one"></div> </li> <li>repeat <div class="two"></div> </li> <li>repeat-x <div class="three"></div> </li> <li>repeat-y <div class="four"></div> </li> <li>space <div class="five"></div> </li> <li>round <div class="six"></div> </li> <li>repeat-x, repeat-y (multiple images) <div class="seven"></div> </li> </ol>
CSS
/* Shared for all DIVS in example */ ol, li { margin: 0; padding: 0; } li { margin-bottom: 12px; } div { background-image: url(https://mdn.mozillademos.org/files/12005/starsolid.gif); width: 160px; height: 70px; } /* Background repeats */ .one { background-repeat: no-repeat; } .two { background-repeat: repeat; } .three { background-repeat: repeat-x; } .four { background-repeat: repeat-y; } .five { background-repeat: space; } .six { background-repeat: round; } /* Multiple images */ .seven { background-image: url(https://mdn.mozillademos.org/files/12005/starsolid.gif), url(https://developer.cdn.mozilla.net/media/redesign/img/favicon32.png); background-repeat: repeat-x, repeat-y; height: 144px; }
结果
在这个例子中, 每一个列表项都使用了不同的background-repeat语法.
规范
|
Specification |
Status |
Comment |
|---|---|---|
|
CSS Backgrounds and Borders Module Level 3The definition of 'background-repeat' in that specification. |
Candidate Recommendation |
Adds support for multiple background images, the two-value syntax allowing distinct repetition behavior for the horizontal and vertical directions, the space and round keywords, and for backgrounds on inline-level elements by precisely defining the background painting area. |
|
CSS Level 2 (Revision 1)The definition of 'background-repeat' in that specification. |
Recommendation |
No significant changes. |
|
CSS Level 1The definition of 'background-repeat' in that specification. |
Recommendation |
Initial definition. |
浏览器兼容性
|
Feature |
Chrome |
Edge |
Firefox |
Internet Explorer |
Opera |
Safari |
|---|---|---|---|---|---|---|
|
Basic Support |
1.0 |
12 |
1.0 |
4 |
3.5 |
1.0 |
|
Multiple backgrounds |
1.0 |
12 |
3.6 |
9 |
10.5 |
1.3 |
|
Two-value syntax (different values for x & y directions) |
(Yes) |
12 |
13.0 |
9.0 |
(Yes) |
(Yes) |
|
round and space keywords |
(Yes) |
12 |
49.0 |
9.0 |
10.5 |
(Yes) |
|
Feature |
Android |
Chrome for Android |
Edge mobile |
Firefox for Android |
IE mobile |
Opera Android |
iOS Safari |
|---|---|---|---|---|---|---|---|
|
Basic Support |
? |
? |
(Yes) |
1.0 |
? |
? |
? |
|
Multiple backgrounds |
? |
? |
(Yes) |
(Yes) |
? |
? |
? |
|
Two-value syntax (different values for x & y directions) |
? |
? |
(Yes) |
13.0 |
? |
? |
? |
|
round and space keywords |
? |
? |
(Yes) |
49.0 |
? |
? |
? |
另见
- 使用多个背景
