fsPromises.appendFile(path, data[, options])

异步地将数据追加到文件,如果该文件尚不存在,则创建该文件。 data 可以是字符串或 Buffer

如果 options 是字符串,则它指定编码。

可以将 path 指定为已打开用于追加(使用 fsPromises.open())的 FileHandle

Asynchronously append data to a file, creating the file if it does not yet exist. data can be a string or a Buffer. The Promise will be resolved with no arguments upon success.

If options is a string, then it specifies the encoding.

The path may be specified as a FileHandle that has been opened for appending (using fsPromises.open()).