The source code

    /**
     * @ignore
     * touch count guard
     * @author yiminghe@gmail.com
     */
    KISSY.add('event/dom/touch/single-touch', function (S) {

        function SingleTouch() {
        }

        SingleTouch.prototype = {
            requiredTouchCount: 1,
            onTouchStart: function (e) {
                var self = this;
                if (e.touches.length != self.requiredTouchCount) {
                    return false;
                }
                self.lastTouches = e.touches;
            },
            onTouchMove: S.noop,
            onTouchEnd: S.noop
        };

        return SingleTouch;

    });