http://dropshado.ws/post/45694832906/touch-identifier-0 
document.body.addEventListener( 'touchstart', function( event ) {
 // dismiss after-touches
 if ( isTouching ) {
  return;
 }
 event.preventDefault();
 // only care about the first touch
 var touch = event.changedTouches[0];
 identifier = touch.identifier;
 log('touch START; indentifer ' + touch.identifier );
 window.addEventListener( 'touchmove', onTouchMove, false );
 window.addEventListener( 'touchend', onTouchEnd, false );
 isTouching = true;
}, false );

function getTouch( event ) {
 // cycle through every change touch and get one that matches
 for ( var i=0, len = event.changedTouches.length; i < len; i++ ) {
  var touch = event.changedTouches[i];
  if ( touch.identifier === identifier ) {
   return touch;
  }
 }
}

function onTouchMove( event ) {
 // get matched touch
 var touch = getTouch( event );
 if ( !touch ) {
  return;
 }
 log( 'touch move ' + touch.pageX + ' ' + touch.pageY );
}

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