var movedCount=0,listLength=lists.length;
function UDFloat(){
    //判断完成的数量，如果已经完成，重置于movedCount为0
    if(movedCount!==0&&movedCount!==listLength){
      return;
    }
    if(movedCount===listLength){
      movedCount=0;
    }

    if (updown) {
        n = 0;
        updown = false;
    } else{
        n = 2;
        updown = true;
    }
    var arr = [50,400,50,50];
    var num = 0;
    timerT= null;
    clearInterval(this.animate);
    timerT = setInterval(function(){
        doMove(lists[num],arr[n],'top',arr[n+1],function(){
          //move完成后，记录完成的数量
          movedCount++;
        });
        num++;
        if(num==lists.length){
            clearInterval(timerT);
        }
    },80)

}