角度发布请求错误

Question

我正在学习来自Java的Angular，我很难搞清楚这一点。我在第一个if语句中得到一个“ReferenceError：user is not defined”，但是在我的另一个控制器中，我正在以完全相同的方式声明一个变量，它工作正常。此错误的文档似乎试图使用超出范围或尚未声明的变量;这里的不一致在哪里？

以下是注入ng-view的表单：

<form role="form" ng-submit="controller.register()">
  <div ng-show="controller.user.username.length > 20">Username must be 20 characters or less.</div>
  <br>
  <div ng-show="controller.user.username = null">Username is blank.</div>
  <br>
  <input type="text" name="username" ng-model="controller.user.username" placeholder="Choose a username." />
  <br/>
  <div ng-show="controller.user.password = null">Password is blank.</div>
  <br>
  <input type="password" name="password" ng-model="controller.user.password" placeholder="Choose a password." />
  <input class="button" type="submit" value="Submit">
  <div>{{controller.msg}}</div>
</form>

这是控制器的相关部分：

wishingWell.controller('register', function($http, $location, $rootScope) {

  var noerrors = false;
  var self = this;
  self.user = {};
  self.msg = undefined;


  if (self.user.username != null && self.user.username.length <= 20 && self.user.password != null) {
    noerrors = true;
  }

  self.register = function() {

    if (noerrors) {
      $http.post('register', user).success(function(response) {

        if (response.data.code == "200") {
          $rootScope.authenticated = true;
          $location.path("/user-home");
        } else {
          msg = response.data.msg;
          $location.path("/sign-up");
        }

      });
    } else {
      $location.path("/sign-up");
    }
  };
});

以下是以类似方式声明变量的登录控制器：

wishingWell.controller('navigation',

  function($rootScope, $http, $location) {

    var self = this;

    var authenticate = function(credentials, callback) {

      var headers = credentials ? {
        authorization: "Basic " + btoa(credentials.username + ":" + credentials.password)
      } : {};

      $http.get('user', {
        headers: headers
      }).then(function(response) {
        if (response.data.name) {
          $rootScope.authenticated = true;
        } else {
          $rootScope.authenticated = false;
        }
        callback && callback();
      }, function() {
        $rootScope.authenticated = false;
        callback && callback();
      });

    }

    authenticate();
    self.credentials = {};
    self.login = function() {
      authenticate(self.credentials, function() {
        if ($rootScope.authenticated) {
          $location.path("/");
          self.error = false;
        } else {
          $location.path("/login");
          self.error = true;
        }
      });
    };
  });