document.documentElement.addEventListener('touchstart', function (event) {
	if (event.touches.length > 1) {
	  event.preventDefault();
	}
}, false);

document.documentElement.addEventListener('touchmove', function (event) {
	if (judgeMultiTouch(event)) event.preventDefault();
}, false);

var lastTouchEnd = 0;
document.documentElement.addEventListener('touchend', function (event) {
	var now = (new Date()).getTime();
	if (now - lastTouchEnd <= 300) {
		event.preventDefault();
	}
	lastTouchEnd = now;
}, false);