前端_无缝滚动效果

<div class="imari_draw">

            <div id="demo">
            <div id="demo1">
            <ul>
            
         
              
              <li>fjwenone&nbsp;在03-27 14:27<br>获得了&nbsp;5集分宝</li>
              
              <li>fjwenone&nbsp;在03-27 14:27<br>获得了&nbsp;5集分宝</li>
              
            </ul>
            </div>
            <div id="demo2">
            <ul>
            
            
              
              <li>fjwenone&nbsp;在03-27 14:27<br>获得了&nbsp;5集分宝</li>
              
              <li>fjwenone&nbsp;在03-27 14:27<br>获得了&nbsp;5集分宝</li>
              
            </ul>
            </div>
            <script type="text/javascript">
            
var speed = 40;
var FGDemo = document.getElementById('demo');
var FGDemo1 = document.getElementById('demo1');
var FGDemo2 = document.getElementById('demo2');
FGDemo2.innerHTML = FGDemo1.innerHTML;
function Marquee1() {
if (FGDemo2.offsetHeight - FGDemo.scrollTop <= 0)
FGDemo.scrollTop -= FGDemo1.offsetHeight;
else {
FGDemo.scrollTop++;
}
}
var MyMar1 = setInterval(Marquee1, speed);
FGDemo.onmouseover = function() {
clearInterval(MyMar1);
};
FGDemo.onmouseout = function() {
MyMar1 = setInterval(Marquee1, speed);
};
function oCopy(txt) {
if (window.clipboardData) {
window.clipboardData.clearData();
window.clipboardData.setData("Text", txt);
} else if (navigator.userAgent.indexOf("Opera") != -1) {
window.location = txt;
} else if (window.netscape) {
try {
netscape.security.PrivilegeManager
.enablePrivilege("UniversalXPConnect");
} catch (e) {
alert("!!被浏览器拒绝！/n请在浏览器地址栏输入’about:config’并回车/n然后将’signed.applets.codebase_principal_support’设置为’true’");
}
var clip = Components.classes["@mozilla.org/widget/clipboard;1"]
.createInstance(Components.interfaces.nsIClipboard);
if (!clip)
return;
var trans = Components.classes["@mozilla.org/widget/transferable;1"]
.createInstance(Components.interfaces.nsITransferable);
if (!trans)
return;
trans.addDataFlavor("text/unicode");
 var str = Components.classes["@mozilla.org/supports-string;1"]
.createInstance(Components.interfaces.nsISupportsString);
str.data = txt;
trans.setTransferData("text/unicode", str, txt.length * 2);
var clipid = Components.interfaces.nsIClipboard;
if (!clipid)
return false;
clip.setData(trans, null, clipid.kGlobalClipboard);
}
}
            </script>
            </div>
        </div>