vue2中less的安装以及使用教程

npm install less-loader@7.0.0

npm install --save less

{
        test: /\.less$/,
        loader: "style-loader!css-loader!less-loader"
}

npm install less-loader -- save-dev 

npm install less --save-dev

@width: 500px;
@height: @width+10px;
@red: #f00;
@transparent: 0.5;
@radius: 30px;

#app {
  width: @width;
  height: @height;
  background-color: @red;
}

.border() {
  border-radius: @radius;
  border-color: @red;
}
 
.colors() {
  primary: #3385ff;
  secondary: green;
}
 
#app {
  width: @width;
  height: @height;
  background-color: @red;
  .border();
}

#app {
  width: 500px;
  height: 510px;
  background-color: #f00;
  border-radius: 30px;
  border-color: #f00;
}

  .inner-app {
    width: @width / 2;
    height: @height / 2;
    background-color: #00f;
  }

.inner-app {
  width: 500px / 2;
  height: 510px / 2;
  background-color: #00f;
}

 .app2 {
    @width: 200px;
    width: @width;
    height: $width;
    background-color: .colors[secondary]; // .colors在上边Mixin里定义的
  }

.app2 {
  width: 200px;
  height: 200px;
  background-color: green;
}

#app {
  width: @width;
  height: @height;
  background-color: @red;
  &:hover {
    opacity: @transparent;
    &::after {
      content: "anc";
    }
    &::before {
      content: "xyt";
    }
  }
}

#app:hover {
  opacity: 0.5;
}
#app:hover::after {
  content: "anc";
}
#app:hover::before {
  content: "xyt";
}