Class Of Marquee Scroll通用不间断滚动JS封装类

function Marquee()
{
    this.ID = document.getElementById(arguments[0]);
    if(!this.ID)
    {
        alert("您要设置的\"" + arguments[0] + "\"初始化错误\r\n请检查标签ID设置是否正确!");
        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 arguments[1] == "number" || typeof arguments[1] == "string")this.Direction = arguments[1];
    if(typeof arguments[2] == "number")this.Step = arguments[2];
    if(typeof arguments[3] == "number")this.Width = arguments[3];
    if(typeof arguments[4] == "number")this.Height = arguments[4];
    if(typeof arguments[5] == "number")this.Timer = arguments[5];
    if(typeof arguments[6] == "number")this.DelayTime = arguments[6];
    if(typeof arguments[7] == "number")this.WaitTime = arguments[7];
    if(typeof arguments[8] == "number")this.ScrollStep = arguments[8];
    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);
    if(arguments.length >= 7)this.Start();
}

Marquee.prototype.Start = function()
{
    if(this.ID == -1)return;
    if(this.WaitTime < 800)this.WaitTime = 800;
    if(this.Timer < 20)this.Timer = 20;
    if(this.Width == 0)this.Width = parseInt(this.ID.style.width);
    if(this.Height == 0)this.Height = parseInt(this.ID.style.height);
    if(typeof this.Direction == "string")this.Direction = this.DirectionArray[this.Direction.toString().toLowerCase()];
    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 = "<table cellspacing='0' cellpadding='0' style='border-collapse:collapse;display:inline;'><tr><td noWrap=true style='white-space: nowrap;word-break:keep-all;'>MSCLASS_TEMP_HTML</td><td noWrap=true style='white-space: nowrap;word-break:keep-all;'>MSCLASS_TEMP_HTML</td></tr></table>";
    var templateTop = "<table cellspacing='0' cellpadding='0' style='border-collapse:collapse;'><tr><td>MSCLASS_TEMP_HTML</td></tr><tr><td>MSCLASS_TEMP_HTML</td></tr></table>";
    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;
    }
}
//-->
[/code]

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