用制作大屏时，使用如下代码设置跑马灯效果没有生效，请大神帮忙解答一下，万分感谢！
setTimeout(function() {
$("div").find("#frozen-north").style.overflow = "hidden";
$("div").find("#frozen-center").style.overflow = "hidden";
}, 111);
//隐藏报表块report0的滚动条
window.flag = true;
setTimeout(function() {
$("#frozen-center").mouseover(function() {
window.flag = false;
})
//鼠标悬停，滚动停止
$("#frozen-center").mouseleave(function() {
window.flag = true;
})
//鼠标离开，继续滚动
var old = -1;
var interval = setInterval(function() {
if(window.flag) {
currentpos = $("#frozen-center").scrollTop;
if(currentpos == old) {
$("#frozen-center").scrollTop = 0;
} else {
old = currentpos;
$("#frozen-center").scrollTop = currentpos + 1.5;
}
}
}, 100);
//以25ms的速度每次滚动3.5PX
}, 1000)
