.css { background-image: url(img@1x.png); } @media only screen and(-webkit-min-device-pixel-ratio: 2) { .css { background-image: url(img@2x.png); } } @media only screen and(-webkit-min-device-pixel-ratio: 3) { .css { background-image: url(img@3x.png); } }
工具https://bjango.com/articles/min-device-pixel-ratio/
原文：http://www.cnblogs.com/hupan508/p/5191764.html