docs: function (fn) {
          if ($platform.touch) {
              var lastTime = Date.now ()
              return this.on ('touchend', function () {
                  var now = Date.now ()
                  if ((now - lastTime) < 200) {
                      fn.apply (this, arguments) }
                  lastTime = now }) }
          else {
              return this.dblclick (fn) } }