[ruby on rails]自关联加载树形数据

html

<div id="test12"></div>
<style>
  .layui-tree-btnGroup {
    visibility: visible;
  }

  .layui-tree-btnGroup .layui-icon {
    padding: 0 10px;
    cursor: pointer;
    transform: scale(1.2);
  }

  .layui-tree-set {
    margin: 20px 0;
    font-size: 20px;
  }
</style>
<script>
  $.ajax({
    url: '/salaries/get_tree_data',
    success: function (res) {
      // layui.use(['tree'], function () {
        var tree = layui.tree,
            data = res;
        //基本演示
        tree.render({
          elem: '#test12',
          data: data,
          showLine: false,
          edit: ['add', 'update', 'del'], //操作节点的图标
          operate: function (obj) {
            var type = obj.type; //得到操作类型：add、edit、del
            var data = obj.data; //得到当前节点的数据
            var elem = obj.elem; //得到当前节点元素

            //Ajax 操作
            va