console.log([data], [...])

var count = 1234;
console.log('count: %d', count);
//輸出結果  count : 1234;
console.log('Hello world');
//輸出結果  Hello world;
console.log('count: %d');
//輸出結果  count: %d;

Console.prototype.log = function() {
  this._stdout.write(util.format.apply(this, arguments) + '/n');
};