学步园

<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>