<div id="demoabc" style="overflow:hidden;width:710px; white-space:nowrap;">
<div id="demoabc1">
<%=gonggaoinfo%>
</div>
<div id="demoabc2"></div>
</div>
<script type="text/javascript">
var dirabc = 1//每步移动像素,数大为快
var speedabc = 20//循环周期(毫秒)数大为慢
demoabc2.innerHTML = demoabc1.innerHTML
function Marqueeabc() {//正常移动
//offsetWidth元素宽
//scrollLeft页面利用滚动条滚动到右侧时,隐藏在滚动条左侧的页面的宽度
if (dirabc > 0 && (demoabc2.offsetWidth - demoabc.scrollLeft) <= 0) demoabc.scrollLeft = 0
if (dirabc < 0 && (demoabc.scrollLeft <= 0)) demoabc.scrollLeft = demoabc2.offsetWidth
demoabc.scrollLeft += dirabc
demoabc.onmouseover = function () { clearInterval(MyMarabc) } //暂停移动
demoabc.onmouseout = function () { MyMarabc = setInterval(Marqueeabc, speedabc) } //继续移动
}
function r_leftabc() { if (dirabc = -1) dirabc = 1 } //换向左移
function r_rightabc() { if (dirabc = 1) dirabc = -1 } //换向右移
var MyMarabc = setInterval(Marqueeabc, speedabc)
</script>
</div>
<div id="demoabc1">
<%=gonggaoinfo%>
</div>
<div id="demoabc2"></div>
</div>
<script type="text/javascript">
var dirabc = 1//每步移动像素,数大为快
var speedabc = 20//循环周期(毫秒)数大为慢
demoabc2.innerHTML = demoabc1.innerHTML
function Marqueeabc() {//正常移动
//offsetWidth元素宽
//scrollLeft页面利用滚动条滚动到右侧时,隐藏在滚动条左侧的页面的宽度
if (dirabc > 0 && (demoabc2.offsetWidth - demoabc.scrollLeft) <= 0) demoabc.scrollLeft = 0
if (dirabc < 0 && (demoabc.scrollLeft <= 0)) demoabc.scrollLeft = demoabc2.offsetWidth
demoabc.scrollLeft += dirabc
demoabc.onmouseover = function () { clearInterval(MyMarabc) } //暂停移动
demoabc.onmouseout = function () { MyMarabc = setInterval(Marqueeabc, speedabc) } //继续移动
}
function r_leftabc() { if (dirabc = -1) dirabc = 1 } //换向左移
function r_rightabc() { if (dirabc = 1) dirabc = -1 } //换向右移
var MyMarabc = setInterval(Marqueeabc, speedabc)
</script>
</div>
或者你将width:710px改成width:50px可以看出有滚动.
http://www.cnblogs.com/insus/archive/2012/03/11/2389855.html