无法通过Rest API从客户端Ajax POST请求接收数据

穆罕默德·穆达西（Muhammad Mudassir）

我在服务器上构建了一些其余的API，并从其他域调用它们，但Get请求工作正常，但是在调用POST请求时遇到了问题。

我无法在客户端发送的服务器上接收数据。

服务器代码：

var express = require('express');
var routes = require('./routes');
var user = require('./routes/user');
var http = require('http');
var path = require('path');
//var fn = require('fn')

var app = express();
var allowCrossDomain = function(req, res, next) {

    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');

    // intercept OPTIONS method
    if ('OPTIONS' === req.method) {
        res.send(200);
    }
    else {
        next();
    }
};

// all environments
app.set('port', process.env.PORT || 3000);
app.use(allowCrossDomain);


// development only
if ('development' == app.get('env')) {
  app.use(express.errorHandler());
}
app.post('/user', user.saveUser);


http.createServer(app).listen(app.get('port'), function(){
  console.log('Express server listening on port ' + app.get('port'));
});

exports.saveUser = function(req, res) {
    var key = req.body.key; //fb,twitter,web
    var userData = req.body.userData;
    var result  = checkUser(userData,key);        
}

客户在哪里进行请求的代码：

var data = { key: 'web', userData: userData }
$.ajax({
    method: "POST",
    //contentType: 'application/json',
    url: "www.acbd.com/user",
    //url:"http://prayable-21641.onmodulus.net/user",
    data: data,
    crossDomain: true,
    dataType: "json"
}).success(function (data, textstatus) {
    // this callback will be called asynchronously
    // when the response is available

    console.log(data)
    console.log(textstatus)
}).error(function (data, textstatus) {
    console.log(data)
    console.log(textstatus)
    // called asynchronously if an error occurs
    // or server returns response with an error status.
});

我无法在服务器上获取密钥或userData，它说未定义：

TypeError：无法读取未定义的属性“键”

Oronbz

您忘记了需要并使用body-parser中间件模块。

而且，为什么内容类型被注释掉了？你需要它

服务器代码应如下所示：

var express = require('express');
var routes = require('./routes');
var user = require('./routes/user');
var http = require('http');
var path = require('path');
//var fn = require('fn')

//requiring body-parser
var bodyParser = require('body-parser');

var app = express();
var allowCrossDomain = function(req, res, next) {

  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');

  // intercept OPTIONS method
  if ('OPTIONS' === req.method) {
      res.send(200);
  }
  else {
      next();
  }
};

// all environments
app.set('port', process.env.PORT || 3000);
app.use(allowCrossDomain);


// development only
if ('development' == app.get('env')) {
  app.use(express.errorHandler());
}

// using body-parser
app.use(bodyParser());

app.post('/user', user.saveUser);


http.createServer(app).listen(app.get('port'), function(){
  console.log('Express server listening on port ' + app.get('port'));
});