您可以使用Express中间件，阻止您的域和方法。

app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", process.env.DOMAIN); // update to match the domain you will make the request from
  res.header("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE");
  res.header(
    "Access-Control-Allow-Headers",
    "Origin, X-Requested-With, Content-Type, Accept"
  );
  next();
});

cors包是在express.js中解决cors策略问题的推荐方法，但你也需要确保在app.options中启用它，如下所示:

const cors = require('cors');

// enable cors
app.use(
  cors({
    origin: true,
    optionsSuccessStatus: 200,
    credentials: true,
  })
);
app.options(
  '*',
  cors({
    origin: true,
    optionsSuccessStatus: 200,
    credentials: true,
  })
);

我发现用npm request包(https://www.npmjs.com/package/request)非常容易做到这一点。

然后我根据这个帖子http://blog.javascripting.com/2015/01/17/dont-hassle-with-cors/给出了我的解决方案

'use strict'

const express = require('express');
const request = require('request');

let proxyConfig = {
    url : {
        base: 'http://servertoreach.com?id=',
    }
}

/* setting up and configuring node express server for the application */
let server = express();
server.set('port', 3000);


/* methods forwarded to the servertoreach proxy  */
server.use('/somethingElse', function(req, res)
{
    let url = proxyConfig.url.base + req.query.id;
    req.pipe(request(url)).pipe(res);
});


/* start the server */
server.listen(server.get('port'), function() {
    console.log('express server with a proxy listening on port ' + server.get('port'));
});

我使用以下步骤我的web应用程序，我成功了:

快递添加cors包:

npm install cors --save

在bodyParser配置后添加以下行。我在bodyParser之前添加了一些麻烦:

 // enable cors to the server
const corsOpt = {
    origin: process.env.CORS_ALLOW_ORIGIN || '*', // this work well to configure origin url in the server
    methods: ['GET', 'PUT', 'POST', 'DELETE', 'OPTIONS'], // to works well with web app, OPTIONS is required
    allowedHeaders: ['Content-Type', 'Authorization'] // allow json and token in the headers
};
app.use(cors(corsOpt)); // cors for all the routes of the application
app.options('*', cors(corsOpt)); // automatic cors gen for HTTP verbs in all routes, This can be redundant but I kept to be sure that will always work.

这对我来说是有效的，因为它是一个很容易实现的路由，im使用meanjs和它的工作精细，safari, chrome等。

app.route('/footer-contact-form').post(emailer.sendFooterMail).options(function(req,res,next){ 
        res.header('Access-Control-Allow-Origin', '*'); 
        res.header('Access-Control-Allow-Methods', 'GET, POST');
        res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
        return res.send(200);

    });

如果您的快速服务器启用了授权，您可以像这样实现

const express = require('express');
const app=express();
const cors=require("cors");
app.use(cors({
   credentials: true, // for authorization
}));
...