angularjs – 广播事件之前未设置广播侦听器

我已经看到了一些$timeout的解决方案,但他们感觉还不错.谢谢！

var app = angular.module('app',[]);

app.controller('ParentCtrl',function ParentCtrl ($scope) {
    this.data = 'parent';
    $scope.$broadcast('parent','Some data'); // event is sent before any listeners are set
});

app.controller('ChildCtrl',function SiblingOneCtrl ($scope) {  
    this.data = 'child';
    $scope.$on('parent',function (event,data) {
      document.write(data); // never activates
    });
});

工作范例：
http://codepen.io/AndriusRimkus/pen/zqMONm