var items = [{
    id: -1,
  pId: -2,
  value: "根目录",
  text: "根目录"
}, {
    id: 1,
  pId: -1,
  value: "第一级目录1",
  text: "第一级目录1"
}, {
    id: 11,
  pId: 1,
  value: "第二级文件1",
  text: "第二级文件1"
}];

BI.createWidget({
  type: "bi.horizontal_auto",
  element: "body",
  items: [{
      type: "bi.multi_tree_combo",
    ref: function (_ref) {
      self.tree = _ref;
    },
    itemsCreator: function (options, callback) {
      console.log(options);

      callback({
        items: items
      });
    },
    width: 300
  }, {
      type: "bi.button",
    text: "getVlaue",
    handler: function () {
      BI.Msg.toast(JSON.stringify(self.tree.getValue()));
    },
    width: 300
  }]
})