小程序Vant组件如何实现默认样式单位由px到rpx的转换

npm init //一路回车

npm install --production

npm i @vant/weapp -S --production

npm install gulp gulp-postcss postcss-px2units --save-dev

var gulp = require('gulp');

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

var pxtounits =  require('postcss-px2units');

gulp.task('css', function () {

  return gulp.src(['miniprogram_npm/@vant/weapp/**/*.wxss'])

    .pipe(postcss([pxtounits({

      multiple: 2,

      targetUnits: 'rpx'

    })]))

    .pipe(gulp.dest('miniprogram_npm/@vant/weapp/'));

});

"scripts": {

   "build": "gulp css",

   "test": "echo \"Error: no test specified\" && exit 1"

 },

npm run build