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How can you click on the element to display it again if it is already hidden?
If you click a button to hide another element, it is still easy to implement!
html

<button ng-click="showFace()">點擊</button>
<p ng-show="facePanel">要顯示或隱藏的元素</p>

No need for functions, just change it a little
<button ng-click="$scope.facePanel=!$scope.facePanel">click</button>

js

angular.directive('aDirective', [function(){
    return {
        restrict: 'E',
        template:'<p a-directive><p ng-show="facePanel">元素</p><button ng-click="showFace()">點擊</button></p>',
        replace: true,
        link: function(scope, ele, attr){
            scope.facePanel = false;
            scope.showFace = function () {
                scope.facePanel = !$scope.facePanel;
            } 
        }
    }
}])

html

<a-directive></a-directive>