sass基础常用指南

$global-color:red;
.nav{
  background:$global-color;  
}

$global-color:yellow;
.nav{
  background-color:$global_color  
}
.footer{
  background-color:$global-color
}

$global-color:red;
$global-border:1px solid $global-color;
.nav{
  backhround:$global-color;
 border:$global-border;    
}

#head{
  .nav{
    background:red;  
   .logo{
      float:left;
    }
  }

  p{
    color:red
 
  }


}

#head{
  a{
    color:biue;
    &:hover{
      color:red
    }      
  }
}

@import "header";

.main{
  color:red;
}

@import "fotter";

@import "header";

.main{
  color:red;
  @import "main";
}


@import "fotter";

以下注释会被编译
/*
*时间：2017-11-18
*auther:liumingwang
*
*/

以下注释不会被编译

//color 静默注释

@import "header";

$color:red!default; //这里是默认变量，“header”里面有个这个变量就用header里面的，header里面没有，就用此页面的默认变量

.head{
  color:$color;
}

@mixin border-radius{
 -moz-border-radius:5px;
 -webkit-border-radius:5px;
 -o-border-radius:5px;
 -ms-border-radius:5px;
 border-radius:5px;
}


.header{
  &-nav{
    @include border-radius;
  }

}

@mixin links-color($nomal,$hover,$visited,$active){
  color:$nomal;
  &:hover{
   color:$hover;
  }
  &:visited{
    color:$visited
  }
  &:active{
    color:$active
  }
}

.header{
  @include links-color(red,blue,green,yellow)
}

.center{
  margin:0 auto;
}

.main{
  @extend .center
}

%center{
  margin: 0 auto;
}

.main{
  @extend %center;
}