doubletap-improved?

doubletap-improved.js

function doubleTouch(element, callback) {
  if ((!element && !callback) || (!callback && typeof element !== 'function')) {
    return;
  } else if (!callback && typeof element === 'function') {
    callback = element;
    element = document;
  }

  var taps = 0;

  function clear() {
    taps = 0;
  }

  element.addEventListener('touchend', function(e) {
    if(++taps === 2) {
      clear();
      return callback(e);
    }

    window.setTimeout(clear, 500);
  });
}

// Pretend jQuery
function $(s) { return document.querySelector(s); };

// document.body
doubleTouch($('body'), function(e) {
  // Do something
});

// document
doubleTouch(function(e) {
  // Do something
});