app.directive('testwindow', function() {
return {
restrict : 'E',
template: '',
replace: true,
controller:function($scope, $element ,$http){

    $scope.getTemplateUrl=function(){  
        var url= getWebRoot() + "/views/"+  
        $scope.dataStore.elementType +".html";  
        return url;  
};  

}

是个比较好的解决方案，mark