nodejs copy files

var fs = require("fs");
var log = function(msg) {
    console.log(msg);
}

function copyFile(source, destination) {
    if (fs.existsSync(source)) {
        var rOption = {
            flags: ‘r‘,
            encoding: null,
            mode: 0666
        }

        var wOption = {
            flags: ‘a‘,
            encoding: null,
            mode: 0666
        }
        var stream = fs.createReadStream(source, rOption);
        var writable = fs.createWriteStream(destination);
        stream.pipe(writable, wOption);
        writable.on(‘close‘, function() {
            log(‘done‘);
        });
        // fs.rename(source, destination,function(){
        //     console.log("ok");
        // });
    }
}

//copyFile("F:\\video\\阿甘正传(1).rmvb", "D:\\阿甘正传(1).rmvb");

function copyDir(dir1, dir2) {
    if (!fs.existsSync(dir2)) {
        fs.mkdirSync(dir2);
    }

    var files = fs.readdirSync(dir1);
    for (var i in files) {
        var file = files[i];
        file1 = dir1 + "\\" + file;
        file2 = dir2 + "\\" + file;
        var sta = fs.statSync(file1);
        if (sta.isDirectory()) {
            copyDir(file1, file2);
        } else {
            copyFile(file1, file2);
        }
    }
}

copyDir("D:\\VM\\centos", "f:\\ttt")