起初是在处理一个图片显示的问题, 图片没有有一部分没有显示出来, 之后用到了background-size, 发现有必要总结一下。
background-size
首先声明
background-size是一个css3属性。 翻译过来很容易就知道它是用来规定背景尺寸的。
关于浏览器兼容性
IE9+、Firefox 4+、Opera、Chrome 以及 Safari 5+。
用法
background-size有4个值分别是(length | percentage | cover | contain)。
length: 它主要是用来规定背景的宽(width)和高(heigth)。eg: background-size: 100px 100px;
percentage: 它主要是用来以父元素的百分比来设置背景的宽高。 eg: background-size: 50% 50%;
length和percentage的用法其实是相似的, 都是通过设置背景的长宽来显示图片。 如果只有一个参数, 则表示另一个参数为auto。
cover: 它主要表示把图片扩展到足够大, 以使背景图像完全覆盖背景区域。 这里要注意背景图像的某些部分也许无法显示在背景定位区域中。eg: background-size: cover;
contain: 它主要表示把图像图像扩展至最大尺寸,以使其宽度和高度完全适应内容区域。eg: background-size: contain;
完全显示图片内容
随便在网上找了张图片url('http://demo.sc.chinaz.com//Files/DownLoad/moban/201512/moban869/images/banner.jpg')
background-size: contain;background: url('http://demo.sc.chinaz.com//Files/DownLoad/moban/201512/moban869/images/banner.jpg') no-repeat

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