NodeJS：执行多个回调时执行回调

Question

这就是我需要做的事情：

function myFunc(ID, callback){
    func1("foo", res => { console.log(res) });
    func2("bar", res => { console.log(res) });
    func3("batz", res => { console.log(res) });

    // Here I need to call callback(something); when all of
    // the above funcs terminated and called their callbacks.

    // I could increment/decrement a counter to know how many
    // callbacks executed, but then how could I execute a function
    // (e.g. a callback) as soon as this counter gets to 0 ?
}

如果可能的话，我需要一个聪明而干净的解决方案（因为我已经发现计数器技巧是一种解决办法）：）

谢谢！