在ios上,background-attachment: fixed;
标签失效,导致背景图无法自适应屏幕。
解决办法:
body:before {
content: ' ';
position: fixed;
z-index: -1;
top: 0;
right: 0;
bottom: 0;
left: 0;
background: url(/images/4.jpg) center 0 no-repeat;
background-size: cover;
}