antd-mobile/2x/es/utils/tree.js

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// 找到树的深度
export function getTreeDeep(treeData, childrenName = 'children') {
  const walker = tree => {
    let deep = 0;
    tree.forEach(item => {
      if (item[childrenName]) {
        deep = Math.max(deep, walker(item[childrenName]) + 1);
      } else {
        deep = Math.max(deep, 1);
      }
    });
    return deep;
  };

  return walker(treeData);
}