关于鸿蒙arkts解析json字符串问题

首先声明喔是小白，但是这个问题已经困扰我很久了，找了很多的资料，看了很多视频，都没能解决，一直卡在这里

同一段字符串，在typescript中运行是正常的，但是在arkts上面运行就是空，求解大神帮忙分析是什么问题

下面是本来的代码，就是简单的处理json字符串

  let str='{"code":1,"msg":"\u6570\u636e\u5217\u8868","page":1,"pagecount":3116,"limit":20,"total":62316,"list":[{"vod_id":"61295","vod_name":"\u4f9d\u5170\u7070\u70ec","type_id":"17","type_name":"\u6cf0\u56fd\u5267","vod_en":"yilanhuijin","vod_time":"2024-12-31 16:06:01","vod_remarks":"\u66f4\u65b0\u81f316\u96c6","vod_play_from":"1080zyk"}]}'
  let obj=JSON.parse(str) as object
  console.log(obj['msg'])

我在DevEco Studio上面的代码是这样子的

export function dataManager(){
  let str='{"code":1,"msg":"\u6570\u636e\u5217\u8868","page":1,"pagecount":3116,"limit":20,"total":62316,"list":[{"vod_id":"61295","vod_name":"\u4f9d\u5170\u7070\u70ec","type_id":"17","type_name":"\u6cf0\u56fd\u5267","vod_en":"yilanhuijin","vod_time":"2024-12-31 16:06:01","vod_remarks":"\u66f4\u65b0\u81f316\u96c6","vod_play_from":"1080zyk"}]}'
  let obj=JSON.parse(str) as object
  console.log(obj['msg'])
  return "333"
}

但是运行结果是

01-01 09:37:37.557   26672-21324   A0c0d0/JSAPP                                          W     The json.parse interface in the Previewer is a mocked implementation and may behave differently than on a real device.
01-01 09:37:37.557   26672-21324   A0c0d0/JSAPP                                          I     undefined
01-01 09:38:17.327   26672-21324   A0c0d0/JSAPP                                          W     The json.parse interface in the Previewer is a mocked implementation and may behave differently than on a real device.
01-01 09:38:17.327   26672-21324   A0c0d0/JSAPP                                          I     undefined
01-01 09:38:41.391   3428-28256    A0c0d0/JSAPP                                          W     The json.parse interface in the Previewer is a mocked implementation and may behave differently than on a real device.
01-01 09:38:41.391   3428-28256    A0c0d0/JSAPP                                          I     undefined

我试着去定义接口

import { JSON } from '@kit.ArkTS';

interface vodDataInterface{
  vod_id: string;
  vod_name: string;
  vod_remarks?: string;
  vod_play_from?: string;
  vod_play_url: string;
  vod_actors?: string;
  vod_director?: string;
  vod_area?: string;
  vod_year?: string;
  vod_class?: string;
  vod_duration?: string;
  vod_content?: string;
  vod_pic?: string;
  vod_score?: string;
  vod_play_note?: string;
  vod_type?: string;
  vod_status?: string;
}

interface httpDataInterface{
  code: number;
  msg: string;
  page: number;
  pagecount: number;
  limit: number;
  total: number;
  list: Array<vodDataInterface>
}

export function dataManager(){
  let str='{"code":1,"msg":"\u6570\u636e\u5217\u8868","page":1,"pagecount":3116,"limit":20,"total":62316,"list":[{"vod_id":"61295","vod_name":"\u4f9d\u5170\u7070\u70ec","type_id":"17","type_name":"\u6cf0\u56fd\u5267","vod_en":"yilanhuijin","vod_time":"2024-12-31 16:06:01","vod_remarks":"\u66f4\u65b0\u81f316\u96c6","vod_play_from":"1080zyk"}]}'
  let obj=JSON.parse(str) as httpDataInterface
  console.log(obj.msg)
  return "333"
}

运行结果仍然是

01-01 09:54:00.245   17252-19888   A0c0d0/JSAPP                                          W     The json.parse interface in the Previewer is a mocked implementation and may behave differently than on a real device.
01-01 09:54:00.245   17252-19888   A0c0d0/JSAPP                                          I     undefined

但是在typescript中运行是正常的

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