/*默认*/an{background-image:url(img@1x.png);}/*2*/@media screen and (-webkit-min-device-pixel-ratio:2){background-image:url(img@2x.png);}/*2*/@media screen and (-webkit-min-device-pixel-ratio:3){background-image:url(img@3x.png);}/*js*/var pixelRadio = window.devicePixelRatio,pics = ['image@' + pixelRadio + 'x.png'],leng = pics.length;
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