/* 封装的TAP事件 */

        (function () {

            /**

             * IOS 和 PC 端 只需要创建一次就能一直使用

             * Android 手机 每次使用的时候都需要从新创建

             */

            function createEvent() {

                var myEvent = document.createEvent("HTMLEvents");

                myEvent.initEvent("tap", true, true);

                return myEvent;

            }

            var oldTime = null, newTime = null;

            var startx, starty, endx, endy;

            document.addEventListener("touchstart", function (ev) {

                ev = ev || event;

                oldTime = new Date().getTime();

                startx = ev.changedTouches[0].clientX;

                starty = ev.changedTouches[0].clientY;

            });

            document.addEventListener("touchend", function (ev) {

                ev = ev || event;

                newTime = new Date().getTime();

                endx = ev.changedTouches[0].clientX;

                endy = ev.changedTouches[0].clientY;

                if(newTime - oldTime > 300) return;

                if(Math.abs(startx - endx) > 10 || (Math.abs(starty - endy)) > 10) return;

                ev.target.dispatchEvent(createEvent());

            });

        })();