angularJs关于指令的一些冷门属性详解

function controllersBoundTransclude(scope, cloneAttachFn, futureParentElement, slotName) {
     var transcludeControllers;
     // No scope passed in:
     if (!isScope(scope)) {
      slotName = futureParentElement;
      futureParentElement = cloneAttachFn;
      cloneAttachFn = scope;
      scope = undefined;
     }

     if (hasElementTranscludeDirective) {
      transcludeControllers = elementControllers;
     }
     if (!futureParentElement) {
      futureParentElement = hasElementTranscludeDirective ? $element.parent() : $element;
     }
     if (slotName) {
      // slotTranscludeFn can be one of three things:
      // * a transclude function - a filled slot
      // * `null` - an optional slot that was not filled
      // * `undefined` - a slot that was not declared (i.e. invalid)
      var slotTranscludeFn = boundTranscludeFn.$$slots[slotName];
      if (slotTranscludeFn) {
       return slotTranscludeFn(scope, cloneAttachFn, transcludeControllers, futureParentElement, scopeToChild);
      } else if (isUndefined(slotTranscludeFn)) {
       throw $compileMinErr('noslot',
        'No parent directive that requires a transclusion with slot name "{0}". ' +
        'Element: {1}',
        slotName, startingTag($element));
      }
     } else {
      return boundTranscludeFn(scope, cloneAttachFn, transcludeControllers, futureParentElement, scopeToChild);
     }
    }

function createBoundTranscludeFn(scope, transcludeFn, previousBoundTranscludeFn) {
   function boundTranscludeFn(transcludedScope, cloneFn, controllers, futureParentElement, containingScope) {

    if (!transcludedScope) {
     transcludedScope = scope.$new(false, containingScope);
     transcludedScope.$$transcluded = true;
    }

    return transcludeFn(transcludedScope, cloneFn, {
     parentBoundTranscludeFn: previousBoundTranscludeFn,
     transcludeControllers: controllers,
     futureParentElement: futureParentElement
    });
   }

angular.module('MyApp', [])
      .directive('dropPanel', function() {
        return {
          transclude: 'element',
          replace: true,
          template: "<div class='drop-panel'>" +
            "<span ng-transclude class='111'></span>" +
            "</div>",
          link: function(scope, el, c, d, $transclude) {
            $transclude(function ngRepeatTransclude(clone, scope) {
              console.log(clone);
            })

          }
        }
      })
      .directive('dropPanel2', function() {
        return {
          transclude: true,
          replace: true,
          template: "<div class='drop-panel'>" +
            "<span ng-transclude class='111'></span>" +
            "</div>",
          link: function(scope, el, c, d, $transclude) {
            $transclude(function ngRepeatTransclude(clone, scope) {
              console.log(clone);
            })
          }
        }
      })