描述：
将下面json转换成model

{
  "code": 0,
  "data": {
    "total": 6,
    "list": [
      {
        "id": "9",
        "sticky": 1,
        "type": "recommend",
        "title": "好课推荐",
        "subtitle": "移动端普通工程师到架构师的全方位蜕变",
        "url": "http://class.imooc.com/sale/mobilearchitect",
        "cover": "https://img1.sycdn.imooc.com//5f057a6a0001f4f918720764.jpg",
        "createTime": "2020-12-03 16:39:24"
      }
    ]
  },
  "msg": "SUCCESS."
}

思路：

可以手写model也可以借助https://www.devio.org/io/tools/json-to-dart/ 来实现model的在线转换