文字上下滚动脚本 只需设计一个层

<script>
/**
** 文学滚动
**
**/
function ScrollText(content, btnPrevious, btnNext, autoStart) {
this.Delay = 10;
this.LineHeight = 20;
this.Amount = 1; //注意:LineHeight一定要能整除Amount.
this.Direction = "up";
this.Timeout = 1500;
this.ScrollContent = this.$(content);
this.ScrollContent.innerHTML += this.ScrollContent.innerHTML;
//this.ScrollContent.scrollTop = 0;
if (btnNext) {
this.NextButton = this.$(btnNext);
this.NextButton.onclick = this.GetFunction(this, "Next");
this.NextButton.onmouseover = this.GetFunction(this, "Stop");
this.NextButton.onmouseout = this.GetFunction(this, "Start");
}
if (btnPrevious) {
this.PreviousButton = this.$(btnPrevious);
this.PreviousButton.onclick = this.GetFunction(this, "Previous");
this.PreviousButton.onmouseover = this.GetFunction(this, "Stop");
this.PreviousButton.onmouseout = this.GetFunction(this, "Start");
}
this.ScrollContent.onmouseover = this.GetFunction(this, "Stop");
this.ScrollContent.onmouseout = this.GetFunction(this, "Start");
if (autoStart) {
this.Start();
}
}

ScrollText.prototype.$ = function(element) {
return document.getElementById(element);
}

ScrollText.prototype.Previous = function() {
clearTimeout(this.AutoScrollTimer);
clearTimeout(this.ScrollTimer);
this.Scroll("up");
}

ScrollText.prototype.Next = function() {
clearTimeout(this.AutoScrollTimer);
clearTimeout(this.ScrollTimer);
this.Scroll("down");
}

ScrollText.prototype.Start = function() {
clearTimeout(this.AutoScrollTimer);
this.AutoScrollTimer = setTimeout(this.GetFunction(this, "AutoScroll"), this.Timeout);
}

ScrollText.prototype.Stop = function() {
clearTimeout(this.ScrollTimer);
clearTimeout(this.AutoScrollTimer);
}

ScrollText.prototype.AutoScroll = function() {
if (this.Direction == "up") {
if (parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2) {
this.ScrollContent.scrollTop = 0;
}
this.ScrollContent.scrollTop += this.Amount;
}
else {
if (parseInt(this.ScrollContent.scrollTop) <= 0) {
this.ScrollContent.scrollTop = parseInt(this.ScrollContent.scrollHeight) / 2;
}
this.ScrollContent.scrollTop -= this.Amount;
}
if (parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0) {
this.ScrollTimer = setTimeout(this.GetFunction(this, "AutoScroll"), this.Delay);
}
else {
this.AutoScrollTimer = setTimeout(this.GetFunction(this, "AutoScroll"), this.Timeout);
}
}

ScrollText.prototype.Scroll = function(direction) {
if (direction == "up") {
if (this.ScrollContent.scrollTop == 0) {
this.ScrollContent.scrollTop = parseInt(this.ScrollContent.scrollHeight) / 2;
}
this.ScrollContent.scrollTop -= this.Amount;
}
else {
this.ScrollContent.scrollTop += this.Amount;
}
if (parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2) {
this.ScrollContent.scrollTop = 0;
}
if (parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0) {
this.ScrollTimer = setTimeout(this.GetFunction(this, "Scroll", direction), this.Delay);
}
}

ScrollText.prototype.GetFunction = function(variable, method, param) {
return function() {
variable[method](param);
}
}

var marquee = new ScrollText("div1");
marquee.LineHeight = 60;
marquee.Amount = 1;
marquee.Timeout = 30;
marquee.Delay = 30;
marquee.Start();

</script>

<div id="div1" runat="server" style="overflow-x: hidden; overflow-y: hidden; width: 250px;
height: 210px; margin-left: 20px;"></div>