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在一個(gè)項(xiàng)目上想用NodeJS，所以邊學(xué)邊練。第一個(gè)遇到的問題就是跨域訪問控制問題。很多初學(xué)者會(huì)遇到同樣問題。

問題

在前端的JS（http://localhost/xxx）中ajax訪問后端RestAPI(http://localhost:3000/….)時(shí)(Chrome)報(bào)錯(cuò)：

XMLHttpRequest cannot load http://localhost:3000/auth/xxx/xxx. Origin http://localhost is not allowed by Access-Control-Allow-Origin.

方案

解決代碼如下：

var express = require('express');var app = express();//設(shè)置跨域訪問app.all('*', function(req, res, next) {    res.header("Access-Control-Allow-Origin", "*");    res.header("Access-Control-Allow-Headers", "X-Requested-With");    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");    res.header("X-Powered-By",' 3.2.1')    res.header("Content-Type", "application/json;charset=utf-8");    next();});app.get('/auth/:id/:password', function(req, res) {    res.send({id:req.params.id, name: req.params.password});});app.listen(3000);console.log('Listening on port 3000...');