跨域，越来也烦。
参考nodejs express 允许跨域访问(Access-Control-Allow-Origin)。
Express中加的位置如下：
var app = express();
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header('Access-Control-Allow-Headers', 'Content-Type');
next();
});
解决NodeJS+Express模块的跨域访问控制问题：Access-Control-Allow-Origin是如下写的：
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);
console.log('Listening on port 3000...');