.container-fixed(@gutter:30px) { margin-right: auto; margin-left: auto; padding-left: floor((@gutter / 2)); padding-right: ceil((@gutter / 2)); &:extend(.clearfix all);
}.clearfix{ &:before, &:after { content: " ";
display: table;
} &:after { clear: both;
}
}.container{ .container-fixed()
}编译结果
.clearfix:before,.clearfix:after,.container:before,.container:after { content: " "; display: table;
}.clearfix:after,.container:after { clear: both;
}.container { margin-right: auto; margin-left: auto; padding-left: 15px; padding-right: 15px;
}明明是container-fixed这个混合去继承了.clearfix，编译结果是container继承，看不明白求指导
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