HTML5 自定义点击事件

        /* 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());
});
})();