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"
}];

var tree = BI.createWidget({
  type: "bi.switch_tree",
  items: items,
});