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？
最佳答案
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:
关于javascript - 无法以 Angular 读取 json 响应，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35495115/