NodeJS+ExpressJS解决跨域请求CORS

虽然前端有多种方式处理跨域,但是多而不精,缺点都比较明显.相对而言更好的方式是通过后端参与处理,这样做不仅适用性更强,同时前端只要发送正常的Ajax请求即可.这样的技术叫做CORS.

    Cross-Origin Resource Sharing跨域资源共享,应该算是现在最为推荐的跨域处理方案.不仅适用于各种Method,而且更加方便和简单.当然了,这么吊的东西只有现代浏览器支持,IE8一下的老古董就不要想了.

var express = require('express');
var app = express();
//设置跨域访问
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);