<div style="position:fixed;top: 50%;width: 20%;margin-left:-10%;transform:translateY(-50%);background: rgb(0,0,0,0.8);text-align:center;left: 50%;height: 70px;display:none; z-index:999;" class="cheng_tan">
<div style="line-height: 70px;color: #ffffff;font-size: 14px;" id="tishi">系统繁忙，请稍后再试~</div>
</div>