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js实现div自动滚动

 
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js实现div自动滚动</title>
<script type="text/javascript">
	function startmarquee(lh, speed, delay) {
		var t;
		var oHeight = 300;/** div的高度 **/　
		var p = false;
		var o = document.getElementById("show");
		var preTop = 0;
		o.scrollTop = 0;
		function start() {
			t = setInterval(scrolling, speed);
			o.scrollTop += 1;
		}
		function scrolling() {
			if (o.scrollTop % lh != 0
					&& o.scrollTop % (o.scrollHeight - oHeight - 1) != 0) {
				preTop = o.scrollTop;
				o.scrollTop += 1;
				if (preTop >= o.scrollHeight || preTop == o.scrollTop) {
					o.scrollTop = 0;
				}
			} else {
				clearInterval(t);
				setTimeout(start, delay);
			}
		}
		setTimeout(start, delay);
	}
	window.onload=function(){
		/**startmarquee(一次滚动高度,速度,停留时间);**/　　
		startmarquee(20, 20, 1500);
	}

</script>
</head>

<body>

	<div id="show"
		style="height: 300px; overflow-y: scroll; overflow-x: scroll;">
		<table width="100%" border="1px" cellspacing="0px"
			style="border-collapse: collapse">
			<thead>
				<tr>
					<td style="background: blue" width="10%">AAA</td>
					<td style="background: blue" width="20%">BBB</td>
					<td style="background: blue" width="50%">CCC</td>
					<td style="background: blue" width="10%">DDD</td>
					<td style="background: blue" width="">DDD</td>
				</tr>
			</thead>

			<tbody>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
				<tr>
					<td>AAA</td>
					<td>BBB</td>
					<td>CCC</td>
					<td>DDD</td>
					<td>DDD</td>
				</tr>
			</tbody>
		</table>
		<div>
</body>
</html>
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