fs.appendFileSync(path, data[, options])

• path <string> | <Buffer> | <URL> | <number> 文件名或文件描述符

  ¥path <string> | <Buffer> | <URL> | <number> filename or file descriptor

• data <string> | <Buffer>

• options <Object> | <string>

  • encoding <string> | <null> 默认值：'utf8'

    ¥encoding <string> | <null> Default: 'utf8'

  • mode <integer> 默认值：0o666

    ¥mode <integer> Default: 0o666

  • flag <string> 参见 支持文件系统 flags。默认值：'a'。

    ¥flag <string> See support of file system flags. Default: 'a'.

  • flush <boolean> 如果是 true，则在关闭基础文件描述符之前将其刷新。默认值：false。

    ¥flush <boolean> If true, the underlying file descriptor is flushed prior to closing it. Default: false.

同步地将数据追加到文件中，如果文件尚不存在则创建该文件。data 可以是字符串或 <Buffer>。

¥Synchronously append data to a file, creating the file if it does not yet exist. data can be a string or a <Buffer>.

mode 选项仅影响新创建的文件。有关详细信息，请参阅 fs.open()。

¥The mode option only affects the newly created file. See fs.open() for more details.

import { appendFileSync } from 'node:fs';

try {
  appendFileSync('message.txt', 'data to append');
  console.log('The "data to append" was appended to file!');
} catch (err) {
  /* Handle the error */
} 拷贝

如果 options 是字符串，则它指定编码：

¥If options is a string, then it specifies the encoding:

import { appendFileSync } from 'node:fs';

appendFileSync('message.txt', 'data to append', 'utf8'); 拷贝

可以将 path 指定为已打开用于追加（使用 fs.open() 或 fs.openSync()）的数字文件描述符。文件描述符不会自动关闭。

¥The path may be specified as a numeric file descriptor that has been opened for appending (using fs.open() or fs.openSync()). The file descriptor will not be closed automatically.

import { openSync, closeSync, appendFileSync } from 'node:fs';

let fd;

try {
  fd = openSync('message.txt', 'a');
  appendFileSync(fd, 'data to append', 'utf8');
} catch (err) {
  /* Handle the error */
} finally {
  if (fd !== undefined)
    closeSync(fd);
} 拷贝