Javascript 离子/phonegap的compass插件中未定义的watchHeading

嗯，我在做一个爱奥尼亚的小项目。我正在使用ngCordova添加一些很酷的插件，比如compass的设备定位。但我不能强迫它工作。我已经安装了ngCordova并添加了插件（地理定位插件工作）。我不知道为什么这不管用

代码如下所示：

.controller('GeoLocationCtrl', function($scope, $cordovaGeolocation, $cordovaDeviceOrientation, $ionicPlatform, $document) {
$scope.lat = 0;
$scope.long = 0;
$scope.position = {};


$ionicPlatform.ready(function() {
var options = {frequency: 1000}; // Update every 1 second
var watch2 = $cordovaDeviceOrientation.watchHeading(options); ///LINE 53!

watch2.promise.then(function (result) { /* unused */
    },
    function (err) {
        // An error occurred
    }, function (position) {
        // Heading comes back in
        // position.magneticHeading
        $scope.position = position.magneticHeading;
    });

    $cordovaDeviceOrientation.clearWatch(watch2.watchId)
        .then(function (result) {
            // Success!
        }, function (err) {
            // An error occurred
        });

  });
})

但我得到的只是：

ripple.js:37
TypeError: Cannot read property 'watchHeading' of undefined
    at Object.watchHeading (http://localhost:8080/lib/ngCordova/dist/ng-        cordova.min.js:1:14565)
    at http://localhost:8080/js/controllers.js:53:44
    at http://localhost:8080/lib/ionic/js/ionic.bundle.js:37388:19
    at Object.ionic.Platform.ready     (http://localhost:8080/lib/ionic/js/ionic.bundle.js:1915:9)
    at Object.self.ready (http://localhost:8080/lib/ionic/js/ionic.bundle.js:37386:26)
    at new <anonymous> (http://localhost:8080/js/controllers.js:15:20)
    at invoke (http://localhost:8080/lib/ionic/js/ionic.bundle.js:11591:17)
    at Object.instantiate (http://localhost:8080/lib/ionic/js/ionic.bundle.js:11602:23)
    at http://localhost:8080/lib/ionic/js/ionic.bundle.js:14906:28
    at updateView (http://localhost:8080/lib/ionic/js/ionic.bundle.js:42986:30) ionic.bundle.js:17696

ripple.js:37
TypeError:无法读取未定义的属性“watchHeading”
在Object.watchHeading(http://localhost:8080/lib/ngCordova/dist/ng-cordova.min.js:1:14565）
在http://localhost:8080/js/controllers.js:53:44
在http://localhost:8080/lib/ionic/js/ionic.bundle.js:37388:19
在Object.ionic.Platform.ready(http://localhost:8080/lib/ionic/js/ionic.bundle.js:1915:9)
准备好了(http://localhost:8080/lib/ionic/js/ionic.bundle.js:37386:26)
在纽约(http://localhost:8080/js/controllers.js:15:20)
在调用时(http://localhost:8080/lib/ionic/js/ionic.bundle.js:11591:17)
在Object.instantiate(http://localhost:8080/lib/ionic/js/ionic.bundle.js:11602:23)
在http://localhost:8080/lib/ionic/js/ionic.bundle.js:14906:28
在updateView(http://localhost:8080/lib/ionic/js/ionic.bundle.js:42986:30)爱奥尼亚.邦德.js:17696

---

谢谢你的帮助

你把插件添加到你的项目中了吗？i、 e.

cordova插件添加org.apache.cordova.device-orientation

对不起，我想我弄乱了描述。。。但是，是的，我以这种方式添加了这个插件。它是在项目源代码中添加的，所以我猜它安装正确。好吧，当我在cordovaDeviceOrientation.watchHeading（选项）上添加console.log时，它也会返回object。所以我几乎可以肯定插件安装得很好