postcss-conditionals

1.安装

# yarn add postcss-conditionals -D

2.配置(postcss.config.js)

module.exports = {
  plugins: [
    ...,
    require('postcss-simple-vars'),//->后
    require('postcss-conditionals')
  ]
}

3.使用

例1：

$type: t1; 
body {
  @if $type == t1 {
    color: red;
  } @else if $type == t2 {
    color: green;
  } @else {
    color: blue;
  }
}