参考资料

WebPack中文文档

使用 devServer.before

devServer配置

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var api = require('../api/api-serve')
devServer: {
    clientLogLevel: 'warning',
    compress: true,
    contentBase: config.dev.contentBase,
    host: config.dev.host,
    port: config.dev.port,
    historyApiFallback: config.dev.historyApiFallback,
    public: config.dev.public,
    open:config.dev.open,
    watchContentBase: config.dev.watchContentBase,
    overlay: config.dev.errorOverlay
    ? { warnings: false, errors: true }
    : false,
    proxy: config.dev.proxyTable,
    quiet: true, // necessary for FriendlyErrorsPlugin
    openPage: openPage,
    watchOptions: config.dev.watchOptions,
    before : function (app){
      api.registerRouter(app);
    }
  }

api-serve.js

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var bodyParser = require('body-parser');
var api = require('./api-request')
exports.registerRouter = function (express_app) {
    var app = express_app;
    app.use(bodyParser.json({limit: '10mb'}));
    app.use(bodyParser.urlencoded({ extended: true }));
    app.get('/api/getUserList', function (req, res) {
       var list = [];
       res.json(list);
    })
    app.post('/api/getUserList', function (req, res) {
        var list = [];
        res.json(list);
    })
}