Question

Web服务器在以下位置监听：http://localhost:3000 在http://localhost:3000/explorer浏览您的REST API D：\ PPL \洗衣\前\ api \ node_modules \ mysql \ lib \ protocol \ Parser.js：80 犯错//抛出非MySQL错误 ^

ReferenceError：未定义环回

Answer 1

Please add this line to fix this Error

    var loopback = require('loopback');

Answer 2

'use strict';

var loopback = require('loopback');
var boot = require('loopback-boot');

var app = module.exports = loopback();

app.use(function(req, res, next) {
  var allowedOrigins = [
    'http://localhost',
    'http://localhost:3000',
    'http://127.0.0.1',
    'http://127.0.0.1:3000',
  ];
  var origin = req.headers.origin;
  if (allowedOrigins.indexOf(origin) > -1) {
    res.setHeader('Access-Control-Allow-Origin', origin);
  }
  res.header('Access-Control-Allow-Methods', 'GET, PUT, POST, DELETE, OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization');
  res.header('Access-Control-Allow-Credentials', true);
  next();
});

app.start = function() {
  // start the web server
  return app.listen(function() {
    app.emit('started');
    var baseUrl = app.get('url').replace(/\/$/, '');
    console.log('Web server listening at: %s', baseUrl);
    if (app.get('loopback-component-explorer')) {
      var explorerPath = app.get('loopback-component-explorer').mountPath;
      console.log('Browse your REST API at %s%s', baseUrl, explorerPath);
    }
  });
};

// Bootstrap the application, configure models, datasources and middleware.
// Sub-apps like REST API are mounted via boot scripts.
boot(app, __dirname, function(err) {
  if (err) throw err;

  // start the server if `$ node server.js`
  if (require.main === module)
    app.start();
});

这可能是示例server.js。请确保引用了loopback模块。

未定义环回

2 个答案: