Copy file in node.

copy.txt

/**
 * Created with JetBrains WebStorm.
 * User: Tristan
 * Date: 14-1-21
 * Time: 上午9:11
 */

var fs = require('fs');

module.exports = function move (oldPath, newPath, callback) {
    fs.rename(oldPath, newPath, function(err) {
        if (err) {
            if (err.code === 'EXDEV') {
                copy();
            } else {
                callback(err);
            }
            return;
        }
        callback();
    });

    function copy() {
        var readStream = fs.createReadStream(oldPath);
        var writeStream = fs.createWriteStream(newPath);
        readStream.on('error', callback);
        writeStream.on('error', callback);
        readStream.on('close', function() {
            fs.unlink(oldPath, callback);
        });
        readStream.pipe(writeStream);
    }
}