jquery的touch事件获取触摸坐标

$('#webchat_scroller').on('touchstart',function(e) {

var touch = e.originalEvent.targetTouches[0];

var y = touch.pageY;

});

$('#webchat_scroller').on('touchmove',function(e) {

var touch = e.originalEvent.targetTouches[0];

var y = touch.pageY;

});

$('#webchat_scroller').on('touchend',function(e) {

var touch = e.originalEvent.changedTouches[0];

var y = touch.pageY;

});