获取背景图列表

{
  "code": 1,
  "show": 1,
  "msg": "",
  "data": [
    {
      "id": 1,
      "name": "轻音乐1",
      "background": {
        "id": 3,
        "category_id": 1,
        "url": "http://worktest.likeadmin.cn//uploads/image/image.jpg"
      }
    }
  ]
}