Marquee.jsは走馬灯の効果を実現します.

/****************************************************************
- Marquee.js
-   ：
- ID：    （  ）
- Direction：    （"top": 0, "up": 0, "bottom": 1, "down": 1, "left": 2, "right": 3）
- Step：  
- Width：  
- Height：  
- Timer：        
- DelayTime：    
- WaitTime：         
- ScrollStep：    
*****************************************************************/
function Marquee(obt) {
    if (obt == null || obt == "") {
        return;
    }

    this.ID = document.getElementById(obt.ID);
    if (!this.ID) {
        alert("     \r
     id      !");
        this.id = -1;
        return;
    }
        
    this.Direction = this.Width = this.Height = this.DelayTime = this.WaitTime = this.CTL = this.StartID = this.Stop = this.MouseOver = 0;
    this.Step = 1;
    this.Timer = 30;
    this.DirectionArray = { "top": 0, "up": 0, "bottom": 1, "down": 1, "left": 2, "right": 3 };
    if (typeof obt.Direction == "number" && obt.Direction) this.Direction = obt.Direction;
    if (typeof obt.Direction == "string" && obt.Direction) this.Direction = this.DirectionArray[obt.Direction.toString().toLowerCase()];
    if (typeof obt.Step == "number" && obt.Step) this.Step = obt.Step;
    if (typeof obt.Width == "number" && obt.Width) this.Width = obt.Width;
    if (typeof obt.Height == "number" && obt.Height) this.Height = obt.Height;
    if (typeof obt.Timer == "number" && obt.Timer) this.Timer = obt.Timer;
    if (typeof obt.DelayTime == "number" && obt.DelayTime) this.DelayTime = obt.DelayTime;
    if (typeof obt.WaitTime == "number" && obt.WaitTime) this.WaitTime = obt.WaitTime;
    if (typeof obt.ScrollStep == "number" && obt.ScrollStep) this.ScrollStep = obt.ScrollStep;
    
    this.ID.style.overflow = this.ID.style.overflowX = this.ID.style.overflowY = "hidden";
    this.ID.noWrap = true;
    this.IsNotOpera = (navigator.userAgent.toLowerCase().indexOf("opera") == -1);
    this.Start();
}

Marquee.prototype.Start = function() {
    if (this.ID == -1) return;
    if (this.Width == 0) this.Width = parseInt(this.ID.style.width);
    if (this.Height == 0) this.Height = parseInt(this.ID.style.height);
    if (this.Timer < 20) this.Timer = 20;
    if (this.WaitTime < 800) this.WaitTime = 800;
    this.HalfWidth = Math.round(this.Width / 2);
    this.HalfHeight = Math.round(this.Height / 2);
    this.BakStep = this.Step;
    this.ID.style.width = this.Width + "px";
    this.ID.style.height = this.Height + "px";
    if (typeof this.ScrollStep != "number") this.ScrollStep = this.Direction > 1 ? this.Width : this.Height;
    var templateLeft = "
MSCLASS_TEMP_HTML
MSCLASS_TEMP_HTML
";
    var templateTop = "
MSCLASS_TEMP_HTML
MSCLASS_TEMP_HTML
";
    var msobj = this;
    msobj.tempHTML = msobj.ID.innerHTML;
    if (msobj.Direction <= 1) {
        msobj.ID.innerHTML = templateTop.replace(/MSCLASS_TEMP_HTML/g, msobj.ID.innerHTML);
    }
    else {
        if (msobj.ScrollStep == 0 && msobj.DelayTime == 0) {
            msobj.ID.innerHTML += msobj.ID.innerHTML;
        }
        else {
            msobj.ID.innerHTML = templateLeft.replace(/MSCLASS_TEMP_HTML/g, msobj.ID.innerHTML);
        }
    }
    var timer = this.Timer;
    var delaytime = this.DelayTime;
    var waittime = this.WaitTime;
    msobj.StartID = function() { msobj.Scroll() }
    msobj.Continue = function() {
        if (msobj.MouseOver == 1) {
            setTimeout(msobj.Continue, delaytime);
        }
        else {
            clearInterval(msobj.TimerID);
            msobj.CTL = msobj.Stop = 0;
            msobj.TimerID = setInterval(msobj.StartID, timer);
        }
    }

    msobj.Pause = function() {
        msobj.Stop = 1;
        clearInterval(msobj.TimerID);
        setTimeout(msobj.Continue, delaytime);
    }

    msobj.Begin = function() {
        msobj.ClientScroll = msobj.Direction > 1 ? msobj.ID.scrollWidth / 2 : msobj.ID.scrollHeight / 2;
        if ((msobj.Direction <= 1 && msobj.ClientScroll <= msobj.Height + msobj.Step) || (msobj.Direction > 1 && msobj.ClientScroll <= msobj.Width + msobj.Step)) {
            msobj.ID.innerHTML = msobj.tempHTML;
            delete (msobj.tempHTML);
            return;
        }
        delete (msobj.tempHTML);
        msobj.TimerID = setInterval(msobj.StartID, timer);
        if (msobj.ScrollStep < 0) return;
        msobj.ID.onmousemove = function(event) {
            if (msobj.ScrollStep == 0 && msobj.Direction > 1) {
                var event = event || window.event;
                if (window.event) {
                    if (msobj.IsNotOpera) {
                        msobj.EventLeft = event.srcElement.id == msobj.ID.id ? event.offsetX - msobj.ID.scrollLeft : event.srcElement.offsetLeft - msobj.ID.scrollLeft + event.offsetX;
                    }
                    else {
                        msobj.ScrollStep = null;
                        return;
                    }
                }
                else {
                    msobj.EventLeft = event.layerX - msobj.ID.scrollLeft;
                }
                msobj.Direction = msobj.EventLeft > msobj.HalfWidth ? 3 : 2;
                msobj.AbsCenter = Math.abs(msobj.HalfWidth - msobj.EventLeft);
                msobj.Step = Math.round(msobj.AbsCenter * (msobj.BakStep * 2) / msobj.HalfWidth);
            }
        }
        msobj.ID.onmouseover = function() {
            if (msobj.ScrollStep == 0) return;
            msobj.MouseOver = 1;
            clearInterval(msobj.TimerID);
        }
        msobj.ID.onmouseout = function() {
            if (msobj.ScrollStep == 0) {
                if (msobj.Step == 0) msobj.Step = 1;
                return;
            }
            msobj.MouseOver = 0;
            if (msobj.Stop == 0) {
                clearInterval(msobj.TimerID);
                msobj.TimerID = setInterval(msobj.StartID, timer);
            }
        }
    }
    setTimeout(msobj.Begin, waittime);
}

Marquee.prototype.Scroll = function() {
    switch (this.Direction) {
        case 0:
            this.CTL += this.Step;
            if (this.CTL >= this.ScrollStep && this.DelayTime > 0) {
                this.ID.scrollTop += this.ScrollStep + this.Step - this.CTL;
                this.Pause();
                return;
            }
            else {
                if (this.ID.scrollTop >= this.ClientScroll) {
                    this.ID.scrollTop -= this.ClientScroll;
                }
                this.ID.scrollTop += this.Step;
            }
            break;

        case 1:
            this.CTL += this.Step;
            if (this.CTL >= this.ScrollStep && this.DelayTime > 0) {
                this.ID.scrollTop -= this.ScrollStep + this.Step - this.CTL;
                this.Pause();
                return;
            }
            else {
                if (this.ID.scrollTop <= 0) {
                    this.ID.scrollTop += this.ClientScroll;
                }
                this.ID.scrollTop -= this.Step;
            }
            break;

        case 2:
            this.CTL += this.Step;
            if (this.CTL >= this.ScrollStep && this.DelayTime > 0) {
                this.ID.scrollLeft += this.ScrollStep + this.Step - this.CTL;
                this.Pause();
                return;
            }
            else {
                if (this.ID.scrollLeft >= this.ClientScroll) {
                    this.ID.scrollLeft -= this.ClientScroll;
                }
                this.ID.scrollLeft += this.Step;
            }
            break;

        case 3:
            this.CTL += this.Step;
            if (this.CTL >= this.ScrollStep && this.DelayTime > 0) {
                this.ID.scrollLeft -= this.ScrollStep + this.Step - this.CTL;
                this.Pause();
                return;
            }
            else {
                if (this.ID.scrollLeft <= 0) {
                    this.ID.scrollLeft += this.ClientScroll;
                }
                this.ID.scrollLeft -= this.Step;
            }
            break;
    }
}

window.onload = function() {
    new Marquee({ ID: "scrollNews", Direction: "top", Step: 2, Width: 0, Height: 80, Timer: 50, DelayTime: 1000, WaitTime: 1000, ScrollStep: 80 });
}