Rails Sass图片 Sass函数和mixins内联图像并获取图像大小: .icon + image-size ( " icon.png " ) background : inline ( " icon.png " ) .icon-wrap width : image - width( " icon.png " ) + 6 px height : image - height( " icon.png " ) 具有HiDPI(Retina)支持: .icon + hidpi-inline ( " icon.png " ) .background + hidpi-image ( " big-image.jpg " ) 和字体支持: @ font-face font-family : " MyFont " src : inline ( " my.w