[
  {
    "id": "ch-001",
    "textbookId": "tb-001",
    "name": "第一章 函数与导数",
    "level": 1,
    "parentId": null,
    "order": 1,
    "children": [
      {
        "id": "ch-001-01",
        "textbookId": "tb-001",
        "name": "1.1 函数的概念与性质",
        "level": 2,
        "parentId": "ch-001",
        "order": 1,
        "children": [
          {
            "id": "ch-001-01-01",
            "textbookId": "tb-001",
            "name": "1.1.1 函数的定义",
            "level": 3,
            "parentId": "ch-001-01",
            "order": 1,
            "children": []
          },
          {
            "id": "ch-001-01-02",
            "textbookId": "tb-001",
            "name": "1.1.2 函数的单调性",
            "level": 3,
            "parentId": "ch-001-01",
            "order": 2,
            "children": []
          }
        ]
      },
      {
        "id": "ch-001-02",
        "textbookId": "tb-001",
        "name": "1.2 导数的概念",
        "level": 2,
        "parentId": "ch-001",
        "order": 2,
        "children": [
          {
            "id": "ch-001-02-01",
            "textbookId": "tb-001",
            "name": "1.2.1 导数的定义",
            "level": 3,
            "parentId": "ch-001-02",
            "order": 1,
            "children": []
          }
        ]
      }
    ]
  },
  {
    "id": "ch-002",
    "textbookId": "tb-001",
    "name": "第二章 三角函数",
    "level": 1,
    "parentId": null,
    "order": 2,
    "children": [
      {
        "id": "ch-002-01",
        "textbookId": "tb-001",
        "name": "2.1 任意角的三角函数",
        "level": 2,
        "parentId": "ch-002",
        "order": 1,
        "children": [
          {
            "id": "ch-002-01-01",
            "textbookId": "tb-001",
            "name": "2.1.1 三角函数定义",
            "level": 3,
            "parentId": "ch-002-01",
            "order": 1,
            "children": []
          }
        ]
      }
    ]
  }
]