/*盒子margin,padding*/
$derections:(t:top, r:right, b:bottom, l:left);
@each $name, $attr in $derections {
@for $i from 0 through 10 {
.yf-m#{$name}#{$i*5} {margin-#{$attr}: $i * 5px !important;}
.yf-p#{$name}#{$i*5} {padding-#{$attr}: $i * 5px !important;}
}
}
