Sass. less .Stylus

Sass 的变量必须是 开始，也可以是任意的字符（但不能是@
&:hover

sass
@mixin error(borderWidth solid #F00;
color: #F00;
}
@ include error();

less
.error(@borderWidth: 2px) {
border: @borderWidth solid #F00;
color: #F00;
}
.error();
stylus
error(borderWidth= 2px) {
border: borderWidth solid #F00;
color: #F00;
}
error()

在 Sass 和 Stylus
@extend .block;
less
.block
@ import "file.css";
[https://blog.csdn.net/onepunchmen00/article/details/86383337?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2]

[https://blog.csdn.net/jiaojsun/article/details/95093505]