请尝试使用 ContentService ，您可以触发下载，甚至通过 TextOutput.downloadAsFile方法设置文件名。您还可以设置返回数据的内容MIME类型，但仅限于预定义的枚举常量。请参阅其示例。

Try using ContentService, you can trigger a download and even set the file name via the TextOutput.downloadAsFile method. You can also set the content mime type of the returned data, though only to a predefined enum constant. See their examples.