angular $emit发送 后退时$on多次接收

angular 并列作用域，作用域不存在上下级关系，$scope.$emit发送时 后退时$rootScope.$on会出现接收多个消息的情况

$rootScope.$on('saveDraft',  function  () {
            $scope.saveDraft();
        });
        $rootScope.$on( 'previewPosition',  function  () {
            $scope.previewPosition();
        });
        $rootScope.$on( 'publishJob',  function  () {
            $scope.publishJob();
        });

    $scope.previewPosition  =  function  () {
        $scope.$emit( 'previewPosition' );
    };
    $scope.saveDraft  =  function  () {
        $scope.$emit( 'saveDraft' );
    };
    $scope.publishJob  =  function  () {
        $scope.$emit( 'publishJob' );
    }; 

正确方式

$scope.$on('saveDraft',  function  () {
            $scope.saveDraft();
        });
        $scope.$on( 'previewPosition',  function  () {
            $scope.previewPosition();
        });
        $scope.$on( 'publishJob',  function  () {
            $scope.publishJob();
        });

    $scope.previewPosition  =  function  () {
        $rootScope.$broadcast( 'previewPosition' );
    };
    $scope.saveDraft  =  function  () {
        $rootScope.$broadcast( 'saveDraft' );
    };
    $scope.publishJob  =  function  () {
        $rootScope.$broadcast( 'publishJob' );
    }; 

 

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