混合

.mixinName1() {
  width: 100px;
  height: 100px;
  color: red;
  background: blue;
}
div {
  .mixinName1;
}
.mixinName2(@width: 10px, @height: 10px, @color: purple, @background: yellowgreen) {
  width: @width;
  height: @height;
  color: @color;
  background: @background;
}
p {
  .mixinName2(50px, 50px, yellow, skyblue url() no-repeat);
}
ul {
  .mixinName2();
  li {
    .mixinName2(@color: red, @background: green);
  }
}

div {
  width: 100px;
  height: 100px;
  color: red;
  background: blue;
}
p {
  width: 50px;
  height: 50px;
  color: yellow;
  background: skyblue url() no-repeat;
}
ul {
  width: 10px;
  height: 10px;
  color: purple;
  background: yellowgreen;
}
ul li {
  width: 10px;
  height: 10px;
  color: red;
  background: green;
}