var speed = 120; //滚动速度 值越小越快
var FGDemo = document.getElementById('demo');
var FGDemo1 = document.getElementById('demo1');
var FGDemo2 = document.getElementById('demo2');
//demo2取demo1的值
FGDemo2.innerHTML = FGDemo1.innerHTML;
function Marquee1() {
//若没有超过滚动高度，则demo2不读取demo1的值
if (FGDemo1.offsetHeight < FGDemo.offsetHeight) FGDemo2.innerHTML = " ";
//滚动
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); }
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