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A plugin for PostCSS that generates rpx units from pixel units, it also can generate units which you want.

$ npm install postcss-px2units --save-dev

With the default settings, we will get this output.

/* input */
p {
  margin: 0 0 20px;
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: 1px; /* no */
}

/* output */
p {
  margin: 0 0 20rpx;
  font-size: 32rpx;
  line-height: 1.2;
  letter-spacing: 1px;
}

var fs = require('fs');
var postcss = require('postcss');
var pxtorem = require('postcss-pxtorem');
var css = fs.readFileSync('main.css', 'utf8');
var options = {
    replace: false
};
var processedCss = postcss(pxtorem(options)).process(css).css;

fs.writeFile('main-rem.css', processedCss, function (err) {
  if (err) {
    throw err;
  }
  console.log('Rem file written.');
});

Type: Object | Null

Default:

{
  divisor: 1,
  multiple: 1,
  decimalPlaces: 2,
  comment: 'no',
  targetUnits: 'rpx'
}

Detail:

• divisor(Number): divisor, replace pixel value with pixel / divisor.
• multiple(Number): multiple, replace pixel value with pixel * multiple.
• decimalPlaces(Number): the number of decimal places. For example, the css code is width: 100px, we will get the vaule is Number(100 / divisor * multiple).toFixed(decimalPlaces).
• comment(String): default value is 'no'. For example, if you set it 'not replace', the css code width: 100px; /* not replace */ will be translated to width: 100px;
• targetUnits(String): The units will replace pixel units, you can set it 'rem'.

var gulp = require('gulp');
var postcss = require('gulp-postcss');
var pxtounits = require('postcss-pxtounits');

gulp.task('css', function () {
  return gulp.src('./test/src/css/**/*.css')
    .pipe(postcss([pxtounits()]))
    .pipe(gulp.dest('./test/dist/css'));
});

If you want to use it in WePY, please use wepy-plugin-px2units.