express 設置允許跨域訪問

//demo
const express = require('express');
const app = express();
//設置允許跨域訪問該服務.

app.all(’’, function (req, res, next) {

res.header(‘Access-Control-Allow-Origin’, '’);

//Access-Control-Allow-Headers ,可根據瀏覽器的F12查看,把對應的粘貼在這里就行

res.header(‘Access-Control-Allow-Headers’, ‘Content-Type’);

res.header(‘Access-Control-Allow-Methods’, ‘*’);

res.header(‘Content-Type’, ‘application/json;charset=utf-8’);

next();

});


app.get(’/hello’, function (req, res) {

res.json({})

});


const server = app.listen(8082, function () {

console.log(‘Express app server listening on port %d’, server.address().port);

});