鸿蒙智能穿戴设备怎样保持后台任务定时获取网络数据？

"backgroundModes": [
  "location",
  "dataTransfer",
  "wifiInteraction"
]
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"reqPermissions": [
  {
    "name": "ohos.permission.LOCATION"
  },
  {
    "name": "ohos.permission.LOCATION_IN_BACKGROUND"
  },
  {
    "name": "ohos.permission.KEEP_BACKGROUND_RUNNING"
  },
  {
    "name": "ohos.permission.GET_NETWORK_INFO"
  },
  {
    "name": "ohos.permission.INTERNET"
  },
  {
    "name": "ohos.permission.SET_NETWORK_INFO"
  },
  {
    "name": "ohos.permission.MANAGE_WIFI_CONNECTION"
  },
  {
    "name": "ohos.permission.SET_WIFI_INFO"
  },
  {
    "name": "ohos.permission.GET_WIFI_INFO"
  }]
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