less 学习记录-匹配继承

//匹配模式基类.sanjiao(@_,@_width:50px,@_color:#ccc){  width: 0;height: 0px;  overflow: hidden;}//匹配模式子类top.sanjiao(top,@_width:50px,@_color:#ccc){  border-width: @_width;  border-color: transparent transparent red transparent;  border-style: dashed dashed solid dashed;}//匹配模式子类bottom.sanjiao(bottom,@_width:5px,@_color:#ccc){  border-width: @_width;  border-color:red transparent transparent  transparent;  border-style: solid dashed dashed  dashed;}.sanjiao_top{  .sanjiao(top);}