javascript多行新闻滚动效果代码

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function EAMarquee()
{
 this.ID = document.getElementById(arguments[0]);
 if(!this.ID)
 {
  //alert("您要设置的"" + arguments[0] + ""初始化错误rn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();
}

EAMarquee.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 = "

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);
}

EAMarquee.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;
 }
}