问题 Let's say that I have a style defined using Less: ul.unstyled, ol.unstyled { margin-left: 0; list-style: none; } Later on, I want to re-use the unstyled class: .my-list { .unstyled; } This doesn't work, however, and I can't figure out the magic to make it work. Any thoughts? 回答1: You can't re-use arbitrary class definitions, only mixins (those starting with a dot). In this case you'll need to duplicate it. 回答2: Try this: .unstyled { margin-left: 0; list-style: none; } .my-list { .unstyled; }