Html 如何拉伸背景图像以填充 div
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How to stretch the background image to fill a div
提问by Muhammad Usman
I want to set a background image to different divs, but my problems are:
我想为不同的 div 设置背景图像，但我的问题是：
- The size of image is fixed(60px).
- Varying div's size
- 图像的大小是固定的（60px）。
- 改变div的大小
How can I stretch the background-image to fill the whole background of the div?
如何拉伸背景图像以填充 div 的整个背景？
#div2{
background-image:url(http://s7.static.hootsuite.com/3-0-48/images/themes/classic/streams/message-gradient.png);
height:180px;
width:200px;
border: 1px solid red;
}
回答by hendos43
回答by Ouadie
You can use:
您可以使用：
background-size: cover;
Or just use a big background image with:
或者只是使用一个大背景图像：
background: url('../images/teaser.jpg') no-repeat center #eee;
回答by jave.web
Modern CSS3 (recommended for the future & probably the best solution)
现代 CSS3（推荐用于未来，可能是最好的解决方案）
.selector{
background-size: cover;
/* stretches background WITHOUT deformation so it would fill the background space,
it may crop the image if the image's dimensions are in different ratio,
than the element dimensions. */
}
Max. stretch without crop nor deformation (may not fill the background):background-size: contain;
Force absolute stretch (may cause deformation, but no crop):background-size: 100% 100%;
最大限度。不裁剪也不变形的拉伸（可能不会填充背景）：background-size: contain;
强制绝对拉伸（可能会导致变形，但不会裁剪）：background-size: 100% 100%;
"Old" CSS "always working" way
“旧” CSS“始终有效”的方式
Absolute positioning image as a first child of the (relative positioned)parent and stretching it to the parent size.
绝对定位图像作为（相对定位）父级的第一个子级并将其拉伸到父级大小。
HTML
HTML
<div class="selector">
<img src="path.extension" alt="alt text">
<!-- some other content -->
</div>
Equivalent of CSS3 background-size: cover;:
等效于 CSS3 background-size: cover;：
To achieve this dynamically, you would have to use the opposite of contain method alternative(see below) and if you need to center the cropped image, you would need a JavaScript to do that dynamically - e.g. using jQuery:
要动态实现这一点，您必须使用相反的包含方法替代（见下文），如果您需要将裁剪图像居中，您将需要一个 JavaScript 来动态地做到这一点 - 例如使用 jQuery：
$('.selector img').each(function(){
$(this).css({
"left": "50%",
"margin-left": "-"+( $(this).width()/2 )+"px",
"top": "50%",
"margin-top": "-"+( $(this).height()/2 )+"px"
});
});
Practical example:
实际例子：
Equivalent of CSS3 background-size: contain;:
等效于 CSS3 background-size: contain;：
This one can be a bit tricky - the dimension of your background that would overflow the parent will have CSS set to 100% the other one to auto.
Practical example:
这个可能有点棘手 - 会溢出父级的背景尺寸会将 CSS 设置为 100%，另一个设置为自动。
实际例子：
.selector img{
position: absolute; top:0; left: 0;
width: 100%;
height: auto;
/* -- OR -- */
/* width: auto;
height: 100%; */
}
Equivalent of CSS3 background-size: 100% 100%;:
等效于 CSS3 background-size: 100% 100%;：
.selector img{
position: absolute; top:0; left: 0;
width: 100%;
height: 100%;
}
PS: To do the equivalents of cover/contain in the "old" way completely dynamically (so you will not have to care about overflows/ratios) you would have to use javascript to detect the ratios for you and set the dimensions as described...
PS：要完全动态地以“旧”方式执行cover/contain的等效操作（因此您不必关心溢出/比率），您必须使用javascript为您检测比率并按照所述设置尺寸。 ..
回答by sandeep
For this you can use CSS3 background-sizeproperty. Write like this:
为此，您可以使用 CSS3background-size属性。像这样写：
#div2{
background-image:url(http://s7.static.hootsuite.com/3-0-48/images/themes/classic/streams/message-gradient.png);
-moz-background-size:100% 100%;
-webkit-background-size:100% 100%;
background-size:100% 100%;
height:180px;
width:200px;
border: 1px solid red;
}
Check this: http://jsfiddle.net/qdzaw/1/
检查这个：http: //jsfiddle.net/qdzaw/1/
回答by Xella
You can add:
你可以加：
#div2{
background-image:url(http://s7.static.hootsuite.com/3-0-48/images/themes/classic/streams/message-gradient.png);
background-size: 100% 100%;
height:180px;
width:200px;
border: 1px solid red;
}
You can read more about it here: css3 background-size
您可以在此处阅读更多相关信息：css3 background-size
回答by Kursat Turkay
body{
margin:0;
background:url('image.png') no-repeat 50% 50% fixed;
background-size: cover;
}
回答by MrBii
by using property css:
通过使用属性 css：
background-size: cover;
回答by jagan reddy
Use: background-size: 100% 100%; To make background image to fit the div size.
使用：背景尺寸：100% 100%；使背景图像适合 div 大小。
回答by Atul Yadav
To keep the aspect ratio, use background-size: 100% auto;
要保持纵横比，请使用 background-size: 100% auto;
div {
background-image: url('image.jpg');
background-size: 100% auto;
width: 150px;
height: 300px;
}
回答by Deejay
Try something like this:
尝试这样的事情：
div {
background-image: url(../img/picture1.jpg);
height: 30em;
background-repeat: no-repeat;
width: 100%;
background-position: center;
}
