从JavaScript调用Angularjs$scope，"Uncaught TypeError: Cannot read property"，angular.element

当我尝试使用AngularJs和JavaScript时，我试图从外部JavaScript函数调用$scope，但我得到了以下错误:

"Uncaught TypeError: Cannot read property 'message' of undefined" .

下面是我的代码:

    <!DOCTYPE html>
    <html> 
    <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
    <script>
    var app = angular.module('app', []);
    var msg = "new message"
    app.controller('ctrl', ['$scope', function ($scope) {
    $scope.message = msg;
    }]);
    function xfunc(){
    var data = angular.
    element(document.querySelector('[ng-controller="ctrl"]')).
    scope().message;
    return data
    }
    if (typeof 'xfunc()' !== 'undefined') {
    console.log(xfunc());
    }else{
    console.log("the type of is : ", + typeof 'xfunc()')
    }
    </script>
    </head>
    <body>
    <div ng-app="app" ng-controller="ctrl">
    {{message}}
    </div>
    </body>
    </html>

我从控制台调用xfunc()，它工作得很好，没有错误。
请问，有人知道错误的原因吗?是否有可能只使用纯Javascript和AngularJS，而不使用第三方库?(当然如果可能的话)
提前感谢!

问题是在AngularJs被引导之前调用的函数，所以解决方案是我添加了:

    document.addEventListener("DOMContentLoaded", function(event) {
    });

在"body"加载之后加载"xfunc()"，所以这里是我的最终代码:

    <!DOCTYPE html>
    <html>
    <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <title></title>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
    <script>
    var app = angular.module('app', []);
    var msg = "new message"
    app.controller('ctrl', ['$scope', function ($scope) {
    $scope.message = msg;
    }]);
    function xfunc(){
    var data = angular.
    element(document.querySelector('[ng-controller="ctrl"]')).
    scope().message;
    return data
    }
    document.addEventListener("DOMContentLoaded", function(event) {
    if (typeof 'xfunc()' !== 'undefined') {
    console.log(xfunc());
    }else{
    console.log("the type of is : ", + typeof 'xfunc()')
    }
    });
    </script>
    </head>
    <body>
    <div ng-app="app" ng-controller="ctrl">
    {{message}}
    </div>
    </body>
    </html>

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