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window.addEventListener("touchend",function(event){
var offset = 100;//at least 100px are a swipe
if(start){
document.body.innerHTML = " single touch end";
//just one finger touched
var end = event.changedTouches.item(0).clientX;

  if(end > start + offset){
   //a left -> right swipe
  document.body.innerHTML = "right";

alert('right')
}
if(end < start - offset ){
//a right -> left swipe
document.body.innerHTML = " left";
alert("left")
}
}
});
//https://jsbin.com/fizenudasi/edit?html
</script>