분명 쌤이 영상에서 나온 것처럼 타이핑을 똑같이 했는데,

전 결과값이 하나도 안나오고 백지가 나옵니다. ㅜㅠ

왜 그럴까요.

작성한 코드 및 에러 메세지

  <script>
        let mise_list = [
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "도심권",
    MSRSTE_NM: "중구",
    PM10: 22,
    PM25: 14,
    O3: 0.018,
    NO2: 0.015,
    CO: 0.4,
    SO2: 0.002,
    IDEX_NM: "좋음",
    IDEX_MVL: 31,
    ARPLT_MAIN: "O3",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "도심권",
    MSRSTE_NM: "종로구",
    PM10: 24,
    PM25: 18,
    O3: 0.013,
    NO2: 0.016,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 39,
    ARPLT_MAIN: "PM25",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "도심권",
    MSRSTE_NM: "용산구",
    PM10: 0,
    PM25: 15,
    O3: 0.012,
    NO2: 0.027,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "점검중",
    IDEX_MVL: -99,
    ARPLT_MAIN: "점검중",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서북권",
    MSRSTE_NM: "은평구",
    PM10: 36,
    PM25: 14,
    O3: 0.019,
    NO2: 0.018,
    CO: 0.5,
    SO2: 0.005,
    IDEX_NM: "좋음",
    IDEX_MVL: 42,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서북권",
    MSRSTE_NM: "서대문구",
    PM10: 28,
    PM25: 9,
    O3: 0.018,
    NO2: 0.015,
    CO: 0.6,
    SO2: 0.004,
    IDEX_NM: "좋음",
    IDEX_MVL: 37,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서북권",
    MSRSTE_NM: "마포구",
    PM10: 26,
    PM25: 8,
    O3: 0.012,
    NO2: 0.021,
    CO: 0.5,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 36,
    ARPLT_MAIN: "NO2",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "광진구",
    PM10: 17,
    PM25: 9,
    O3: 0.018,
    NO2: 0.016,
    CO: 0.6,
    SO2: 0.001,
    IDEX_NM: "좋음",
    IDEX_MVL: 31,
    ARPLT_MAIN: "O3",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "성동구",
    PM10: 21,
    PM25: 12,
    O3: 0.018,
    NO2: 0.017,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 33,
    ARPLT_MAIN: "PM25",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "중랑구",
    PM10: 27,
    PM25: 10,
    O3: 0.015,
    NO2: 0.019,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 34,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "동대문구",
    PM10: 26,
    PM25: 9,
    O3: 0.016,
    NO2: 0.017,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 34,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "성북구",
    PM10: 27,
    PM25: 8,
    O3: 0.022,
    NO2: 0.014,
    CO: 0.5,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 37,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "도봉구",
    PM10: 25,
    PM25: 12,
    O3: 0.024,
    NO2: 0.011,
    CO: 0.3,
    SO2: 0.002,
    IDEX_NM: "좋음",
    IDEX_MVL: 41,
    ARPLT_MAIN: "O3",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "강북구",
    PM10: 30,
    PM25: 15,
    O3: 0.022,
    NO2: 0.02,
    CO: 0.4,
    SO2: 0.002,
    IDEX_NM: "좋음",
    IDEX_MVL: 39,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동북권",
    MSRSTE_NM: "노원구",
    PM10: 21,
    PM25: 14,
    O3: 0.017,
    NO2: 0.016,
    CO: 0.4,
    SO2: 0.004,
    IDEX_NM: "좋음",
    IDEX_MVL: 36,
    ARPLT_MAIN: "PM25",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서남권",
    MSRSTE_NM: "강서구",
    PM10: 36,
    PM25: 16,
    O3: 0.021,
    NO2: 0.013,
    CO: 0.4,
    SO2: 0.004,
    IDEX_NM: "좋음",
    IDEX_MVL: 42,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서남권",
    MSRSTE_NM: "구로구",
    PM10: 23,
    PM25: 10,
    O3: 0.022,
    NO2: 0.016,
    CO: 0.3,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 37,
    ARPLT_MAIN: "O3",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서남권",
    MSRSTE_NM: "영등포구",
    PM10: 29,
    PM25: 15,
    O3: 0.01,
    NO2: 0.022,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 41,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서남권",
    MSRSTE_NM: "동작구",
    PM10: 29,
    PM25: 15,
    O3: 0.012,
    NO2: 0.023,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 41,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서남권",
    MSRSTE_NM: "관악구",
    PM10: 27,
    PM25: 12,
    O3: 0.012,
    NO2: 0.022,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 37,
    ARPLT_MAIN: "NO2",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서남권",
    MSRSTE_NM: "금천구",
    PM10: 25,
    PM25: 15,
    O3: 0.015,
    NO2: 0.02,
    CO: 0.4,
    SO2: 0.004,
    IDEX_NM: "좋음",
    IDEX_MVL: 43,
    ARPLT_MAIN: "PM25",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "서남권",
    MSRSTE_NM: "양천구",
    PM10: 0,
    PM25: 14,
    O3: 0.016,
    NO2: 0.017,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "점검중",
    IDEX_MVL: -99,
    ARPLT_MAIN: "점검중",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동남권",
    MSRSTE_NM: "강남구",
    PM10: 31,
    PM25: 16,
    O3: 0.018,
    NO2: 0.018,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 39,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동남권",
    MSRSTE_NM: "서초구",
    PM10: 34,
    PM25: 13,
    O3: 0.024,
    NO2: 0.019,
    CO: 0.3,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 41,
    ARPLT_MAIN: "PM10",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동남권",
    MSRSTE_NM: "송파구",
    PM10: 25,
    PM25: 6,
    O3: 0.014,
    NO2: 0.025,
    CO: 0.4,
    SO2: 0.003,
    IDEX_NM: "좋음",
    IDEX_MVL: 42,
    ARPLT_MAIN: "NO2",
  },
  {
    MSRDT: "201912052100",
    MSRRGN_NM: "동남권",
    MSRSTE_NM: "강동구",
    PM10: 24,
    PM25: 14,
    O3: 0.016,
    NO2: 0.02,
    CO: 0.4,
    SO2: 0.002,
    IDEX_NM: "좋음",
    IDEX_MVL: 39,
    ARPLT_MAIN: "PM25",
  },
];


        for (let i = 0; i < mise_list.length; i++) {
          if (mise_list[i]['INDEX_MVL'] < 40) {
            console.log(mise_list[i]['MSRSTE_NM'])

          }
        }

  </script>