code: function elementGetTransition(element) {
      var directive = element.aNode.directives.transition;
      var owner = element.owner;
  
      if (element.nodeType === NodeType.CMPT) {
          var cmptGivenTransition = element.source && element.source.directives.transition;
          if (cmptGivenTransition) {
              directive = cmptGivenTransition;
          }
          else {
              owner = element;
          }
      }
  
      var transition;
      if (directive && owner) {
          transition = findMethod(owner, directive.value.name);
  
          if (typeof transition === 'function') {
              transition = transition.apply(
                  owner,
                  evalArgs(directive.value.args, element.scope, owner)
              );
          }
      }
  
      return transition || element.transition;
  }
docs: 获取 element 的 transition 控制对象
  
  @param {Object} element 元素
  @return {Object?}