uni-app 中扩展表示当前平台的环境变量

const webpack = require('webpack');
const env = process.env.UNI_PLATFORM;
module.exports = {
    configureWebpack: {
        plugins: [
            new webpack.DefinePlugin({
                'process.env': {
                    'APP_ENV': JSON.stringify(env),
                }
            }),
        ]
    }
};