在任意嵌套的JSON数据中访问特定字段

{
  "status": "200",
  "msg": "",
  "data": {
    "time": "1515580011",
    "video_info": [
      {
          "announcement": "{\"announcement_id\":\"6\",\"name\":\"INS\u8d26\u53f7\",\"icon\":\"http:\\/\\/liveme.cms.ksmobile.net\\/live\\/announcement\\/2017-08-18_19:44:54\\/ins.png\",\"icon_new\":\"http:\\/\\/liveme.cms.ksmobile.net\\/live\\/announcement\\/2017-10-20_22:24:38\\/4.png\",\"videoid\":\"15154610218328614178\",\"content\":\"FOLLOW ME PLEASE\",\"x_coordinate\":\"0.22\",\"y_coordinate\":\"0.23\"}",
          "announcement_shop": "",
{
  "status": "200",
  "msg": "",
  "data": {