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common/style/mixin.styl

@@ -38,7 +38,8 @@ _fj(x=space-between,y=center,r=row,n=nowrap)
   flex-wrap: n
 
 // 背景图片地址和大小
-_bis(url,w,h=auto,x=center,y=center)
+_bis(c=transparent,url,w,h=auto,x=center,y=center)
+  background-color: c
   background-position: x y
   background-size: w h
   background-image: url(url)