时间:2021-07-01 10:21:17 帮助过:41人阅读
方法一、利用CSS3.0样式新特性实现北京全屏 (不支持ie6-8)
html { background: url(images/bg.jpg) no-repeat center center fixed; -webkit-background-size: cover; -moz-background-size: cover; -o-background-size: cover; background-size: cover; }
或:
html{ background:url('background.jpg') no-repeat center center; min-height:100%; background-size:cover; } body{ min-height:100%; }
原理:将html及body设置为最小高度为100%,使用css3中的background-size:cover;将背景图片设置成封面全屏模式。
兼容性:
Safari 3+
Chrome Whatever+
IE 9+
Opera 10+
Firefox 3.6+
方法二、使用jQuery实现
HTML代码:
<img src="images/bg.jpg" id="bg" alt="">
CSS代码:
#bg { position: fixed; top: 0; left: 0; } .bgwidth { width: 100%; } .bgheight { height: 100%; }
jQuery代码:
$(window).load(function() { var theWindow = $(window), $bg = $("#bg"), aspectRatio = $bg.width() / $bg.height(); function resizeBg() { if ( (theWindow.width() / theWindow.height()) < aspectRatio ) { $bg .removeClass() .addClass('bgheight'); } else { $bg .removeClass() .addClass('bgwidth'); } } theWindow.resize(resizeBg).trigger("resize"); });
兼容性:
IE7+
任何桌面浏览器
方法二、使用jQuery实现(附)【使用jQuery插件jQuery.fullBg】
First comes the plugin code:
/** * jQuery.fullBg * Version 1.0 * Copyright (c) 2010 c.bavota - http://bavotasan.com * Dual licensed under MIT and GPL. * Date: 02/23/2010 **/ (function($) { $.fn.fullBg = function(){ var bgImg = $(this); function resizeImg() { var imgwidth = bgImg.width(); var imgheight = bgImg.height(); var winwidth = $(window).width(); var winheight = $(window).height(); var widthratio = winwidth / imgwidth; var heightratio = winheight / imgheight; var widthdiff = heightratio * imgwidth; var heightdiff = widthratio * imgheight; if(heightdiff>winheight) { bgImg.css({ width: winwidth+'px', height: heightdiff+'px' }); } else { bgImg.css({ width: widthdiff+'px', height: winheight+'px' }); } } resizeImg(); $(window).resize(function() { resizeImg(); }); }; })(jQuery)
There is only a little CSS needed for this one:
.fullBg { position: absolute; top: 0; left: 0; overflow: hidden; } #maincontent { position: absolute; top: 0; left: 0; z-index: 50; }
If you want your background to stay fixed you can change the .fullBG CSS to this:
.fullBg { position: fixed; top: 0; left: 0; overflow: hidden; }
For the HTML markup, you can just add an image tag with an id or class, but you also need to add a div that contains your main content or else it won’t work properly. This is the bare minimum:
<img src="your-background-image.jpg" alt="" id="background" /> <div id="maincontent"> <!-- Your site content goes here --> </div>
To call the jQuery function, add this to the bottom of your web page, right before the closing body tag:
<script type="text/javascript"> $(window).load(function() { $("#background").fullBg(); }); </script>
Once again, this plugin is pretty simple so no options are available. It pretty much just does what it does.
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