我使用节点事件模块异步执行我的函数。

var events = require('events');
var eventEmitter = new events.EventEmitter();

eventEmitter.on('myEvent', f2);

function f1(x, y) {
    console.log('got', x, y)

    eventEmitter.emit('myEvent', x, y);
    eventEmitter.emit('myEvent', x, y);
    eventEmitter.emit('myEvent', x, y);

    console.log('done')
}

var count = 0
function f2(x, y) {
    count++;
    console.log('from f2', x, y, count)
}

f1(1, 2)

其输出为

alok@alok-HP-Laptop-14s-cf3xxx:~/tmp/test-node$ node alok.js 
got 1 2
from f2 1 2 1
from f2 1 2 2
from f2 1 2 3
done

我的预期输出为

got 1 2
done
from f2 1 2 1
from f2 1 2 2
from f2 1 2 3

为什么console.log('done')在最后运行。或者为什么执行是同步的？