AngularJS directive scope problem, $apply

A very strange problem was found in the project, why is it depressed....

Questions are as follows

A variable is defined in the controller, $scope.test = "123";

Then define an instruction to trigger the event to change $scope.test = "666666" At this point, $scope.test can be successfully modified, outputting 666666

Then define a $scope.gotest = function(){} function to output $scope.test, but, but, but... the output result is 123, I am depressed...

code show as below

1、html

<ion-view>
    <ion-content>
        <div class="button-bar">
            <div class="bgstyle" change-element>First</div>
        </div>
        {{test}}
        <a ng-click="gotest()">go</a>
    </ion-content>
</ion-view>
<style>  
    .bgstyle{background-color:#8f8f8f;width:100%;height:30px;margin:2px 0 2px 0;text-align:center}
</style>

2、controller

appControllers.controller("ScopeabcCtrl", function ($scope,$rootScope) {
    $scope.test = "123";

    $scope.gotest = function(){
        console.log($scope.test);
    }
})

3、directive

appDirectives.directive("changeElement", function () {
    return {
        scope: false,
        link: function (scope, elements) {
            elements[0].onclick = function () {
                scope.test = "666666";
            };
        }
    };
});

Follow up...

After consulting the great god, I found that the problem can be solved, and the problem can be solved by adding scope.$apply(function () {}); The code is as follows

appDirectives.directive("changeElement", function () {
    return {
        scope:false,
        replace: true,
        link: function (scope, elements) {
            elements[0].onclick = function () {
                scope.$apply(function () {
     　　         scope.test = "666666";
                });
            };
        }
    };
});

appDirectives.directive("changeElement", function () {
    return {
        scope:false,
        replace: true,
        link: function (scope, elements) {
            elements[0].onclick = function () {
     　　       scope.test = "666666";
                scope.$digest();//This can be replaced by $apply                
            };
        }
    };
});

$apply postback binding

$scope.getMessage = function () {
    setTimeout(function () {
        $scope.$apply(function () {
            //wrapped this within $apply
            $scope.message = 'Hello World';
            console.log('message:' + $scope.message);
        });
    }, 2000);
}

AngularJS directive scope problem, $apply

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