It's not angular's fault. Angular is designed to work in JSON world. So when $http service send AJAX request, it send all your data as a payload, not as form-data so that your backend application can handle it. But jQuery does some things internally. You instruct jQuery's $ajax module to bind form-data as JSON but before sending AJAX request, it serialized JSON and add application/x-www-form-urlencoded header. This way your backend application able to received form-data in form of post parameters and not JSON.

但是你可以修改angular $http服务的默认行为

添加标题 序列化json

$httpParamSerializerJQLike是angular的内置服务，它以同样的方式序列化json。jQuery的参数。

$http({
    method: 'POST',
    url: 'request-url',
    data: $httpParamSerializerJQLike(json-form-data),
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8;'
    }
});

如果你需要一个插件先将表单数据序列化成JSON，可以使用这个插件https://github.com/marioizquierdo/jquery.serializeJSON

用这种方法。没必要写这么多

 isAuth = $http.post("Yr URL", {username: username, password: password});

在nodejs的后端

app.post("Yr URL",function(req,resp)
{

  var username = req.body.username||req.param('username');
  var password = req.body.password||req.param('password');
}

我希望这对你们有帮助

我没有评论的名声，但作为对don F的回答的回应/补充:

$params = json_decode(file_get_contents('php://input'));

为了正确地返回一个关联数组，需要在json_decode函数中添加第二个参数true:

$params = json_decode(file_get_contents('php://input')， true);

我在快递上也遇到了同样的问题。为了解决这个问题，你必须在发送HTTP请求之前使用bodyparser来解析json对象。

app.use(bodyParser.json());

根据@felipe-miosso的回答:

从这里下载一个AngularJS模块， 安装它 将它添加到您的应用程序: Var app = angular。模块('my_app'，[…], ' httpPostFix ']);

我喜欢使用函数将对象转换为post参数。

myobject = {'one':'1','two':'2','three':'3'}

Object.toparams = function ObjecttoParams(obj) {
    var p = [];
    for (var key in obj) {
        p.push(key + '=' + encodeURIComponent(obj[key]));
    }
    return p.join('&');
};

$http({
    method: 'POST',
    url: url,
    data: Object.toparams(myobject),
    headers: {'Content-Type': 'application/x-www-form-urlencoded'}
})