重置_.after计数器

Question

I looked on the internet, but I was not able to find a way of resetting the _.after counter after the code inside gets executed. In this example, my intended functionality would mean that only every 5th click on the button would show the alert box:

var cb;

cb = _.after(4, function() {
    alert(':)');
});

$('button').on('click', cb);

http://jsfiddle.net/danharper/JkcuD/

Answer 1

you can't reset or even see the counter because the counter is private:

from: http://underscorejs.org/docs/underscore.html#section-87

 _.after = function(times, func) {
    return function() {
      if (--times < 1) {
        return func.apply(this, arguments);
      }
    };
  };

that said, you can see there's not much code there, so adjusting it to run once-every is easy:

 _.onceEvery= function(times, func) {
    var orig = times;
    return function() {
      if (--times < 1) {
        times=orig;
        return func.apply(this, arguments);
      }
    };
  };

example: http://jsfiddle.net/JkcuD/78/