js拖动效果 touchstart mousedown

<script src="extras/jquery.min.1.7.js"></script>
<div class="game" id="game" style="position: absolute;top: 0;left: 0">
    <div>dsafsdf</div>
</div>
<script>
    isTouch = 'ontouchstart' in window
    var mouseEvents = (isTouch) ?
    {
        down: 'touchstart',
        move: 'touchmove',
        up: 'touchend',
        over: 'touchstart',
        out: 'touchend'
    }
            :
    {
        down: 'mousedown',
        move: 'mousemove',
        up: 'mouseup',
        over: 'mouseover',
        out: 'mouseout'
    }
    var eventHandlers={
        touchStart:function(){

        }
    }
    var down=null
      document.getElementById("game").addEventListener(mouseEvents.down,function(e, opts, corner){
          down=this
            console.log(this)

      },false)
    document.addEventListener(mouseEvents.move,function(e, opts, corner){
        if(down){
            e=e.changedTouches? e.changedTouches[0]:e
            $(down).css({"left":e.pageX,"top": e.pageY})
            console.log(e)
        }


    },false)
    document.addEventListener(mouseEvents.up,function(e, opts, corner){
        down=null

    },false)
    document.addEventListener(mouseEvents.over,function(e, opts, corner){


    },false)
//    $(this).bind(mouseEvents.down, data.eventHandlers.touchStart).
//            bind('end', turnMethods._eventEnd).
//            bind('pressed', turnMethods._eventPressed).
//            bind('released', turnMethods._eventReleased).
//            bind('flip', turnMethods._flip);
//
//    $(this).parent().bind('start', data.eventHandlers.start);
//
//    $(document).bind(mouseEvents.move, data.eventHandlers.touchMove).
//            bind(mouseEvents.up, data.eventHandlers.touchEnd);
</script>