前端老生

How to load a small css background image before lots of other images (html element in .css file)?

https://stackoverflow.com/questions/21255349/how-to-load-a-small-css-background-image-before-lots-of-other-images-html-eleme

https://stackoverflow.com/questions/7883281/preloading-background-image-on-homepage

https://stackoverflow.com/questions/1373142/preloading-css-images