保证1920px的图片,在低分率率的电脑上也能正常显示,两边裁剪,中间居中,高度不变
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title></head><body><div class="test"><div style="width: 100%;height: 390px; background: url(/o_1bvue57hgbp8ms1diu18ctjnrh.jpg) no-repeat center;background-size: 1920px 390px;"></div></div></body></html>