react-native-ocss/test/for-postcss/css/index2.css

#### 干嘛

@define-mixin test $color:blue {
    color: $color;
}

@define-mixin test2 $color:blue {
    .hellow {
        color: $color;
    }
}

.nihao {
    @test #fff
}

@test2

@test2 red