img 自适应屏幕:width:100%;display: inline-block;
background-image: url(img/xxx.jpg);自适应background-repeat:no-repeat; background-size:100% 100%;-moz-background-size:100% 100%;
img 自适应屏幕:width:100%;display: inline-block;
background-image: url(img/xxx.jpg);自适应background-repeat:no-repeat; background-size:100% 100%;-moz-background-size:100% 100%;