如何在Node中附加文件? [英] How to append to a file in Node?

问题描述

我正在尝试将字符串追加到日志文件.但是writeFile每次写入字符串之前都会擦除内容.

I am trying to append a string to a log file. However writeFile will erase the content each time before writing the string.

fs.writeFile('log.txt', 'Hello Node', function (err) {
  if (err) throw err;
  console.log('It\'s saved!');
}); // => message.txt erased, contains only 'Hello Node'

有什么想法可以轻松实现吗?

Any idea how to do this the easy way?

推荐答案

对于偶尔的追加，您可以使用appendFile，每次调用它时都会创建一个新的文件句柄:

For occasional appends, you can use appendFile, which creates a new file handle each time it's called:

异步:

const fs = require('fs');

fs.appendFile('message.txt', 'data to append', function (err) {
  if (err) throw err;
  console.log('Saved!');
});

同步:

const fs = require('fs');

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

但是，如果您重复附加到同一文件，最好

But if you append repeatedly to the same file, it's much better to reuse the file handle.

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