node.js跨域问题

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", "*"); //核心
    res.header("Access-Control-Allow-Headers", "X-Requested-With"); //核心
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS"); //核心
    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...');