背景自动滚动

From:http://bbs.blueidea.com/thread-2970016-1-1.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <mce:script type="text/javascript"></mce:script> </head> <body style="margin:0; padding:0" mce_style="margin: 0; padding: 0;"> <div id="scrollBackground" style="width:1440px; height:300px; background:url(http://youlove.us/template/theme/youloveus/img/bg.jpg) no-repeat 0 0"></div> </body> </html>

代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
window.onload = function(){
    var scrollBackground = {
        object:document.getElementById("scrollBackground"),
        endTop:3700,
        nowTop:0
    };
    
    var scrollInterval = setInterval(function(){
        scrollBackground.nowTop = (scrollBackground.nowTop!=scrollBackground.endTop)?(scrollBackground.nowTop+1):0;
        scrollBackground.object.style.backgroundPosition = "0px -" + scrollBackground.nowTop + "px";
    },50);
}
</script>
</head>
<body style="margin:0; padding:0">
<div id="scrollBackground" style="width:1440px; height:300px; background:url(http://youlove.us/template/theme/youloveus/img/bg.jpg) no-repeat 0 0"></div>00;">
</body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
window.onload = function(){
    var scrollBackground = {
        object:document.getElementById("scrollBackground"),
        endTop:3700,
        nowTop:0
    };
     
    var scrollInterval = setInterval(function(){
        scrollBackground.nowTop = (scrollBackground.nowTop!=scrollBackground.endTop)?(scrollBackground.nowTop+1):0;
        scrollBackground.object.style.backgroundPosition = "0px -" + scrollBackground.nowTop + "px";
    },50);
}
</script>
</head>
<body style="margin:0; padding:0">
<div id="scrollBackground" style="width:1440px; height:300px; background:url(http://youlove.us/template/theme/youloveus/img/bg.jpg) no-repeat 0 0"></div>
</body>
</html>