dist/vue-draggable-nested-tree.es.js
function targetNodeHasChildrenExcludingPlaceholder(info) {
    return findChild(info, info.targetNode.children, function (v) {
      return v !== info.dplh;
    });
  }
function targetNodeHasChildrenExcludingPlaceholder(info) {
    return findChild(info, info.targetNode.children, function (v) {
      return v !== info.dplh;
    });
  }
另一节点有子(不包括占位节点)