fsPromises.writeFile(file, data[, options])

• file <string> | <Buffer> | <URL> | <FileHandle> 文件名或 FileHandle
• data <string> | <Buffer> | <Uint8Array>
• options <Object> | <string>
  • encoding <string> | <null> 默认值: 'utf8'
  • mode <integer> 默认值: 0o666
  • flag <string> 请参阅对文件系统 flags 的支持。 默认值: 'w'。
• 返回: <Promise>

异步地将数据写入文件，如果文件已经存在，则替换该文件。 data 可以是字符串或缓冲区。

如果 data 是缓冲区，则忽略 encoding 选项。

如果 options 是字符串，则它指定编码。

任何指定的 FileHandle 都必须支持写入。

• file <string> | <Buffer> | <URL> | <FileHandle> filename or FileHandle
• data <string> | <Buffer> | <Uint8Array>
• options <Object> | <string>
  • encoding <string> | <null> Default: 'utf8'
  • mode <integer> Default: 0o666
  • flag <string> See support of file system flags. Default: 'w'.
• Returns: <Promise>

Asynchronously writes data to a file, replacing the file if it already exists. data can be a string or a buffer. The Promise will be resolved with no arguments upon success.

The encoding option is ignored if data is a buffer.

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

Any specified FileHandle has to support writing.

It is unsafe to use fsPromises.writeFile() multiple times on the same file without waiting for the Promise to be resolved (or rejected).