.directive(‘expander‘, function() {
    /*
    expander()
    restrict: E,A,C,M(元素,属性,样式,注释)
    transclude:true替换
    compile（编译）和link（连接）
    <expander class=‘expander‘ expander-title=‘title‘></expander>

*/
    
    
    var scope ={title : ‘=expanderTitle‘};
    var template = ‘<div><div class="title" ng-click="toggle()">{{title}}</div><div class="body" ng-show="showMe" ng-transclude></div></div>‘;
    var link = function(scope, element, attrs){

        scope.showMe = false;
        scope.toggle = function toggle() {
            scope.showMe = !scope.showMe;
        }
    }
    return {
        restrict : ‘EA‘,
        replace : true,
        transclude : true,
        scope : scope,
        template : template,
        link : link
    //    link : function(scope, element, attrs) {}
    }
})