less中background:url问题

Question

background: url(${@http}/img/icon/[e-mail]) no-repeat center 3rem / auto 25%;@http是一个变量这样书写会不现实，也没有解析！请问该怎么办？

Answer 1

应该是background: url('@{http}/img/icon/[e-mail]') no-repeat center 3rem / auto 25%;