javascript - 无法以 Angular 读取 json 响应

Question

js 和 node.js，我在 json 响应方面遇到了一些麻烦。我有一个执行 REST api 获取的 node.js 服务器，并且 json 结果必须发送到 Angular 客户端，但是当我尝试时要读取该 json 文件，我获得了 [Object,Object]。我无法弄清楚我缺少什么。感谢您帮助我。来自 REST API 的 Json 文件响应:

[ { cityPK: { name: 'Lodi', region: 'Lombardia' } },
{ cityPK: { name: 'Frosinone', region: 'Lazio' } },
{ cityPK: { name: 'Roma', region: 'Lazio' } },
{ cityPK: { name: 'Tivoli', region: 'Lazio' } } ]

node.js 文件:

var http = require('http');
var request = require('request');
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.urlencoded({extended:false}));
app.use(bodyParser.json());

app.post('/login',function(req,res){
    console.log("sono nella post "+req.body.username);
    var uid = req.body.username;
    var upwd = req.body.password;
    res.setHeader('Content-Type', 'application/json');
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    res.header("Access-Control-Allow-Credentials", true);



    request({
        url: "http://localhost:8080/RestServiceAdmin/webresources/entities.city",
        method: "GET",
        json: true ,
        headers:[{'content-type': 'application/json'}] 
    }, function (error, response, body){
           if(!error & response.statusCode === 200){
               res.json(body);
           }
    });
});
    app.listen(9080,function(){
    console.log('Server running at http://127.0.0.1:9080/');
});

Angular 客户端:

 var app = angular.module('myApp',[]);
        app.controller('myCtrl',function($scope,$http){
            $scope.check = function(data){
                var id = data.form.id;
                var pwd = data.form.password;
                console.log("utente è "+id+",password è "+pwd);
                var msg = {username: id,password: pwd};
                $http({
                    url:'http://localhost:9080/login', //senza niente qui,metti * in app.post()
                    method:"POST",
                    data: $.param(msg),
                    responseType: "application/json",
                    headers: {'Content-Type': 'application/x-www-form-urlencoded',
                              'Accept': 'application/json' 
                              }})
                        .then(function(response){

                            console.log("Server response "+response.data);
                    });
            };
        });

我认为“response.data”应该给我json文件，而它返回我[Object,Object]。我出了什么问题？

Answer 1

解决方案

你就快到了!

只需将日志语句中的+更改为,即可。

像这样:

console.log("Server response ", response.data);

原因

+ 运算符将尝试将对象连接到字符串，该对象不是字符串，因此它调用 toString()函数，它向您显示[Object,Object]，这意味着您有一个包含对象的对象。

当您使用逗号时，它将检查对象。

来自 toString()文档:

Every object has a toString() method that is automatically called when the object is to be represented as a text value or when an object is referred to in a manner in which a string is expected. By default, the toString() method is inherited by every object descended from Object. If this method is not overridden in a custom object, toString() returns "[object type]", where type is the object type. The following code illustrates this: