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


    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>.

    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 */
    }

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

    import { appendFileSync } from 'node:fs';
    
    appendFileSync('message.txt', 'data to append', 'utf8');

    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);
    }