您的 resourceId 不完整，因为它没有向 API 标识如何解释 videoId代码>参数.尝试设置 resourceId 的 kind 属性，如下所示:

Your resourceId isn't complete, as it doesn't identify to the API how to interpret the videoId parameter. Try setting the kind attribute of the resourceId, like this:

  "snippet": {
    "playlistId": "PL8hD12HFC-nuswc21_e64aPAy9B25sEH7",
    "resourceId": {
      "kind": "***#video",
      "videoId": "KMGuyGY5gvY"
    }
  }

这样，API 就会知道在哪个域"(可以这么说)中定位由您发送的字符串标识的资源.

That way, the API will know in which 'domain' (so to speak) to locate the resource identified by the string you send in.