<div id="updateFormBlockDiv" class="layui-input-block"> <ul id="menuTree2" class="dtree" data-id="0"></ul> </div> var data = { 0: {YY: "string0", HLS: "string0", YZ: "string0"}, 1: {DV: "string1", TYH: "string1", NM: "string1"}, 2: {NG: "string2", EFY: "string2", WRE: "string2"}, }; var treeData = []; for (var key in data) { if (data.hasOwnProperty(key)) { var node = { id: key, title: key, children: [] }; for (var prop in data[key]) { if (data[key].hasOwnProperty(prop)) { node.children.push({ id: prop, title: prop //data[key][prop] }); } } treeData.push(node); } } console.log(treeData, 'treeDatatreeData') dtree.render({ elem: '#menuTree2', data: treeData, skin: "blueStyle", // ficon: ["2", "-1"], // 隐藏二级图标 // icon: '-1', // 隐藏二级图标 select: true, toolbar: true, }); 为何无法收缩了

根据您提供的代码，您的树形结构数据中的每个节点都没有子节点，因此无法展开或收缩。您可以通过修改`node.children`数组中的数据，将每个节点的子节点添加到其中，以便展开或收缩节点。例如，您可以修改代码如下：

var data = {
  0: {YY: "string0", HLS: "string0", YZ: "string0"},
  1: {DV: "string1", TYH: "string1", NM: "string1"},
  2: {NG: "string2", EFY: "string2", WRE: "string2"},
};

var treeData = [];
for (var key in data) {
  if (data.hasOwnProperty(key)) {
    var node = { id: key, title: key, children: [] };
    for (var prop in data[key]) {
      if (data[key].hasOwnProperty(prop)) {
        node.children.push({ id: prop, title: prop, children: [] });
      }
    }
    treeData.push(node);
  }
}

console.log(treeData, 'treeDatatreeData')

dtree.render({
  elem: '#menuTree2',
  data: treeData,
  skin: "blueStyle",
  select: true,
  toolbar: true,
});

在上面的代码中，我们将每个子节点的`children`属性设置为空数组，以便在需要时添加子节点。这样，您就可以展开或收缩节点了。