firepro/.postcssrc.js

module.exports = {
	plugins: {
		//...
		'autoprefixer': {
			browsers: ['Android >= 4.0', 'iOS >= 7']
		},
		'postcss-pxtorem': {
			rootValue: 37.5, //vant-UI的官方根字体大小是37.5
			propList: ['*']
		}
	}
}