下载 cors
npm install cors要害代码
const cors = require('cors');app.use(cors());app.all('*', function (req, res, next) { // 域名白名单, 不能写 * ,因为*是通配符 所有网站都能够拜访 // res.setHeader('Access-Control-Allow-Origin', '*'); // 独自配置白名单,也就是能进行跨域拜访的网址 res.setHeader('Access-Control-Allow-Origin', ['http://127.0.0.1:8000']); //...Headers必须的固定值,"content-type" res.setHeader('Access-Control-Allow-Headers', 'X-request-With,content-type'); // res.setHeader("Access-Control-Allow-Headers","X-request-With"); res.setHeader('Access-Control-Allow-Methods', 'GET,POST,DELETE,PUT,OPTIONS'); // 放行/下一步 不能省 next();});残缺代码
const express = require('express');const path = require('path');const logger = require('morgan');const cookieParser = require('cookie-parser');const bodyParser = require('body-parser');const cookieSession = require('cookie-session');const apiRoutes = require('./routes/api');const cors = require('cors');const app = express();// view engine setupapp.set('views', path.join(__dirname, 'views'));app.set('view engine', 'ejs');// uncomment after placing your favicon in /publicapp.use(logger('dev'));app.use(bodyParser.json());app.use(bodyParser.urlencoded({ extended: false }));app.use(cookieParser());app.use( cookieSession({ name: 'session', secret: 'sdfasd@d34sdf@', maxAge: 24 * 60 * 60 * 1000 * 7, }));app.use(cors());app.use(express.static(path.join(__dirname, 'public')));// 相当于拼接门路app.use('/api', apiRoutes);// catch 404 and forward to error handlerapp.use(function (req, res, next) { const err = new Error('Not Found'); err.status = 404; next(err);});app.all('*', function (req, res, next) { // 相当于域名白名单, 不能写 * ,因为*是通配符 所有网站都能够拜访 // res.setHeader('Access-Control-Allow-Origin', '*'); // 独自配置白名单,也就是能进行跨域拜访的网址 res.setHeader('Access-Control-Allow-Origin', ['http://127.0.0.1:8000']); //...Headers必须的固定值,"content-type" res.setHeader('Access-Control-Allow-Headers', 'X-request-With,content-type'); // res.setHeader("Access-Control-Allow-Headers","X-request-With"); res.setHeader('Access-Control-Allow-Methods', 'GET,POST,DELETE,PUT,OPTIONS'); // 放行/下一步 不能省 next();});// error handlerapp.use(function (err, req, res, next) { // set locals, only providing error in development res.locals.message = err.message; res.locals.error = req.app.get('env') === 'development' ? err : {}; // render the error page res.status(err.status || 500); res.render('error');});module.exports = app;