菜单格式如下

[
  {
    "children": [],
    "mText": "一级菜单1"
  },
  {
    "children": [
      {
        "children": [],
        "mText": "二级菜单1"
      },
      {
        "children": [],
        "mText": "二级菜单2"
      }
    ],
    "mText": "一级菜单2"
  },
  {
    "children": [
      {
        "children": [
          {
            "children": [],
            "mText": "三级菜单1"
          },
          {
            "children": [],
            "mText": "三级菜单2"
          }
        ],
        "mText": "二级菜单1"
      },
      {
        "children": [
          {
            "children": [],
            "mText": "三级菜单1"
          }
        ],
        "mText": "二级菜单2"
      }
    ],
    "mText": "一级菜单3"
  }
]

搜索最下一级菜单名称，想得到他的父级、父级的父级、父级的父级的父级……，如搜索 三级菜单1得到如下的数据：

[
  {
    "children": [
      {
        "children": [
          {
            "children": [],
            "mText": "三级菜单1"
          }
        ],
        "mText": "二级菜单1"
      },
      {
        "children": [
          {
            "children": [],
            "mText": "三级菜单1"
          }
        ],
        "mText": "二级菜单2"
      }
    ],
    "mText": "一级菜单3"
  }
]