IOT-AUTH/code/web/middlewares/webpack-dev.js

'use strict';
const express = require('express')
const webpack = require('webpack');
const devConfig = require('../webpack.config');
const middleware = require('webpack-dev-middleware');
const proxy = require('koa-better-http-proxy');
const url = require('url');

const compiler = webpack(devConfig);

module.exports = {
    entry: function (app, router, opts) {
        app.use(proxy('http://localhost:5201', {
            filter: function (ctx) {
                return /\/build/.test(url.parse(ctx.url).path);
            },
            proxyReqPathResolver: function (ctx) {
                return 'client' + url.parse(ctx.url).path;
            }
        }));

        app.use(proxy('http://localhost:5201', {
            filter: function (ctx) {
                return /\/$/.test(url.parse(ctx.url).path);
            },
            proxyReqPathResolver: function (ctx) {
                return 'client/build/index.html';
            }
        }));

        const server = express();

        server.all("*", function (req, res, next) {
            //设置允许跨域的域名，*代表允许任意域名跨域
            res.header("Access-Control-Allow-Origin", "*");
            //允许的header类型
            res.header("Access-Control-Allow-Headers", "content-type");
            //跨域允许的请求方式 
            res.header("Access-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
            if (req.method == 'OPTIONS')
               res.sendStatus(200); //让options尝试请求快速结束
            else
               next();
         });
         
        server.use(middleware(compiler));
        // server.use(require("webpack-hot-middleware")(compiler));
        server.listen('5201', function (err) {
            if (err) {
                console.error(err);
            } else {
                console.info(`webpack-dev listen 5201`);
            }
        })
    }
};