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<style type="text/css">
#gundong {
width: 320px;
margin: 0 auto;
background: #dd127b;
height: 28px;
line-height: 28px;
overflow: hidden;
font-size: 14px;
color: #fff;
font-weight: bold;
}
</style>
<div id="gundong">asdddfsddsfdfsddd2523ddsfdddddr2ddetetdddgdfs8o980dd12dsaczvbety</div>
<script>
var gundong = document.getElementById("gundong");
var step =1,scrollWidth=gundong.scrollWidth-gundong.offsetWidth;
var timer=setInterval(function () {
gundong.scrollLeft += step;
if (step > 0 && gundong.scrollLeft >= scrollWidth) step = -step;
else if (step <0 && gundong.scrollLeft <=0) step = -step;
}, 50)
</script>