Is there a SASS rule for outputting a descendant to the root?

问题

Using SASS & Compass, can you still write in an indented descendant manner but add a rule/command so that the given descendant is written to another level e.g. root?

So this:

#example-id-1 {
    background: blue:

    #example-id-2 {
        background: red:

        #example-id-3 {
            background: yellow:
        }

    }

}

would normally output this:

#example-id-1 { background: blue: }
#example-id-1 #example-id-2 { background: red: }
#example-id-1 #example-id-2 #example-id-3 { background: yellow: }

but can a rule be applied to #example-id-2 or #example-id-3 so that the output becomes this:

#example-id-1 { background: blue: }
#example-id-2 { background: red: }
#example-id-3 { background: yellow: }

Many thanks

回答1:

You're looking for @at-root:

#example-id-1 {
    background: blue;

    @at-root #example-id-2 {
        background: red;

        @at-root #example-id-3 {
            background: yellow;
        }
    }
}

Note that this is a Sass 3.3 feature.

来源：https://stackoverflow.com/questions/25827695/is-there-a-sass-rule-for-outputting-a-descendant-to-the-root