自动扩展背景图像
[英]Automatically Extending a Background Image
问题描述
I am trying to use an image for my background. 
我正在尝试使用图像作为背景。 The content of the page has a height of 800px. 页面内容的高度为800px。 So on a tall screen you should be able to see a chunk of the background image after the content and on a shorter screen it may fit perfectly so that the content ends right at the bottom of the screen with little to no background image below. 因此，在较高的屏幕上，您应该能够在内容之后看到大块的背景图像，而在较短的屏幕上，它可能恰好适合，因此内容恰好在屏幕底部结束，而下方几乎没有背景图像。
I want the background image to automatically extend so no matter what size the screen is it will fill the entire screen. 我希望背景图像自动扩展，因此无论屏幕大小如何，它都将填满整个屏幕。 I have tried a couple of things, like setting the height for img.extfullbackground to auto, but then the scroll area goes WAY to far down (like 3000px) and 100% only goes to the size of the content. 我尝试了几件事，例如将img.extfullbackground的高度设置为auto，但随后滚动区域的方式大大降低了（例如3000px），而100％仅达到内容的大小。
Does anyone know how I can make the background image automatically extend to the size of the screen? 有谁知道我如何使背景图像自动扩展到屏幕尺寸？
Here is a snippet of my HTML: 这是我的HTML的代码段：
</head>
<body class="extfullbackground">
<img class="extfullbackground" src=".\background.png" alt="background" />
<div class="topbackground">
<div class="top">
<div class="topleft">
<img class="pf_logo" src=".\pf_logo.png" alt="PF Logo"/>
</div>
<div class="topmiddle">
<h1 class="title">PF is Temporarily Unavailable</h1>
</div>
<div class="topright" ></div>
</div>
</div>
<div class="bar"></div>
<div style="width:1220px; height:600px; padding-top:0px; margin-top:0px; margin-left:auto; margin-right:auto; background-color:blue;">
<div class="extcontentcontainer">
<h2 class="subtitle">Please be patient while we update PF.</h2>
<p class="pad10 line10">
Here's my CSS: (note: I used a CSS Reset script) 这是我的CSS ：（注意：我使用了CSS重置脚本）
body {
position:relative;
padding:0 0 0 0;
margin:0 0 0 0;
overflow-x:hidden;
}
.extcontentcontainer {
width:820px;
height:600px;
margin-left:auto;
margin-right:auto;
margin-top:0px;
padding-top:0px;
background-color:red;
}
img.extfullbackground {
position:absolute;
z-index:-1;
top:0;
left:0;
width:100%; /* alternative: right:0; */
height:auto; /* alternative: bottom:0; */
padding-left:0px;
padding-right:0px;
margin-left:0px;
margin-right:0px;
}
2 个解决方案
解决方案1
1 已采纳 2013-06-03 14:02:45
body {
background: url('background.png');
background-size: cover;
}
This worked for me on IE8. 这在IE8上对我有用。 (it was an emulator on my iMac) （这是我的iMac上的模拟器）
Else: why don't you set the image height to 100% and nothing for width. 否则：为什么不将图像高度设置为100％，而宽度则没有设置。 The image should keep it's ratio and extend to cover the entire height of the browser. 图片应保持比例不变，并应覆盖浏览器的整个高度。
解决方案2
0 2013-06-03 13:39:05
You should try this (html): 您应该尝试使用此（html）：
<img src="bg.jpg" class="bg" alt="achtergrond">
css: CSS：
img.bg {
min-height: 100%;
min-width: 1024px;
width: 100%;
height: auto;
position: fixed;
top: 0;
left: 0;
z-index:-999;
pointer-events: none;
}
@media screen and (max-width: 1024px) {
img.bg {
left: 50%;
margin-left: -512px;
pointer-events: none;
}
}
this will stretch the background to fill-screen when the screen is wider than 1024, and to stay 1024 px when less. 当屏幕宽度大于1024时，这会将背景拉伸到填充屏幕，而当屏幕小于1024时，则将背景保持为1024 px。
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