在线演示
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>test</title>
<style type="text/css">
*{ margin:0; padding:0;}
body{font:12px/1 '微软雅黑';background: #fff;}
.wrap{ 140px; padding:10px;}
.info{ padding-top:10px; overflow:hidden;}
.inner{ 1000px;height:172px; height:17px; line-height:17px; overflow:hidden;}
.inner p{ display:inline-block;}
</style>
</head>
<body>
<div class="wrap">
<div class="img"><img src="http://dummyimage.com/140x90/" alt=""/></div>
<div id="info" class="info">
<div class="inner">
<p class="txt">文字如果超出了自动向左滚动</p>
</div>
</div>
</div>
<script>
function scroll(){
var info = document.getElementById('info');
var div = info.getElementsByTagName('div')[0];
var p = document.getElementsByTagName('p')[0];
var p_w = p.offsetWidth;
var div_w = info.offsetWidth;
if(div_w > p_w){ return false; }
div.innerHTML += div.innerHTML;
setInterval(function(){
if(p_w <= info.scrollLeft){
info.scrollLeft -= p_w;
} else {
info.scrollLeft++;
}
}, 30);
}
scroll();
</script>
</body>
</html>
引用：http://bbs.csdn.net/topics/390908118