fd = fs.openSync(path.join(process.cwd(), 'log.txt'), 'a')
fs.writeSync(fd, 'contents to append')
fs.closeSync(fd)

尝试使用flags: 'a'将数据附加到文件中

 var stream = fs.createWriteStream("udp-stream.log", {'flags': 'a'});
  stream.once('open', function(fd) {
    stream.write(msg+"\r\n");
  });

我包装了async fs。appendFile变成一个基于promise的函数。希望它能帮助其他人看到这是如何运作的。

    append (path, name, data) {

        return new Promise(async (resolve, reject) => {

            try {

                fs.appendFile((path + name), data, async (err) => {

                    if (!err) {

                        return resolve((path + name));

                    } else {

                        return reject(err);

                    }

                });

            } catch (err) {

                return reject(err);

            }

        });

    }

const inovioLogger = (logger = "") => {
    const log_file = fs.createWriteStream(__dirname + `/../../inoviopay-${new Date().toISOString().slice(0, 10)}.log`, { flags: 'a' });
    const log_stdout = process.stdout;
    log_file.write(logger + '\n');
}

使用createWriteStream的代码为每次写入创建一个文件描述符。日志。End更好，因为它要求节点在写入后立即关闭。

var fs = require('fs');
var logStream = fs.createWriteStream('log.txt', {flags: 'a'});
// use {flags: 'a'} to append and {flags: 'w'} to erase and write a new file
logStream.write('Initial line...');
logStream.end('this is the end line');

Node.js 0.8有fs.appendFile:

fs.appendFile('message.txt', 'data to append', (err) => {
  if (err) throw err;
  console.log('The "data to append" was appended to file!');
});

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