Node追加内容到文件

覆盖文件:

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

自己的答案:

var log = fs.createWriteStream('log.txt', {'flags': 'a'});
// use {'flags': 'a'} to append and {'flags': 'w'} to erase and write a new file
log.write("this is a message");

后面有人对作者自己给出的答案的评价:
Your code using createWriteStream creates a file descriptor for every write. log.end is better because it asks node to close immediatelly after the write.

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

最佳答案: (since node 0.8)

fs.appendFile('message.txt', 'data to append', function (err) {

});

其它答案:

var fs = require('fs'), str = 'string to append to file';
fs.open('filepath', 'a', 666, function( e, id ) {
  fs.write( id, 'string to append to file', null, 'utf8', function(){
    fs.close(id, function(){
      console.log('file closed');
    });
  });
});

其它答案:

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

不好的答案:

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