常用less

1、The !important keyword

.foo (@bg: #f5f5f5, @color: #900) {  background: @bg;  color: @color;}.unimportant {  .foo();}.important {  .foo() !important;}

.unimportant{background:#f5f5f5;color:#900}.important{background:#f5f5f5 !important;color:#900 !important}

2、Selectors

@mySelector: banner;// Usage.@{mySelector} {  font-weight: bold;  line-height: 40px;  margin: 0 auto;}

.banner{font-weight:bold;line-height:40px;margin:0 auto}

@property: color;.widget {  @{property}: #0ee;  background-@{property}: #999;}

.widget{color:#0ee;background-color:#999}