Node.js：关于在Node.js中使用fs.writeFile（）函数的注意事项

Question

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

I have a question regarding the use of the function fs.writeFile() in Node, and the fact that it prints strings into a textfile.

At the moment, I have a piece of code that prints the following into console. Instead of the console, I would like to modify the code a bit so it would print into a textfile.

var options = {
  host: 'www.google.com',
  path: '/'
};

http.get(options, function(response) {
  console.log("Status Code: " + response.statusCode);

  for(var item in response.headers) {
    console.log(item + ": " + response.headers[item]);
  }

I would like to replace console.log with fs.writeFile , however, the Hello Node part of the input in fs.writeFile() is a string. Thus, I am stuck on this part.

The documentation for fs.writeFile() for Node.js is here: http://nodejs.org/api/fs.html

As explained in the documentation, this is how the fs.writeFile function works fs.writeFile(filename, data, [encoding], [callback]) . My question is in regards to the data input.

I am fairly new to Node.js, therefore I would like to get some feedback on this, and hopefully work the solution out myself with some pointers.

EDIT 1: Do I use String() which then turns my function into a string? I don't think this is right, but it could be a possibility.

Answer 1

This is the code that solved it:

http.get(options, function(res) {
  fs.appendFile('log.txt', "Status Code: " + res.statusCode + "\n");

  for(var item in res.headers) {
    fs.appendFile('log.txt', item + ": " + res.headers[item] + "\n");
  }
}).on('error', function(e) {
  console.log("Error: " + e.message);
});

I used fs.appendFile