基于Marquee.js插件实现的跑马灯效果示例

/****************************************************************- Marquee.js- 参数：- ID：滚动对象（必须）- Direction：滚动方向（"top": 0, "up": 0, "bottom": 1, "down": 1, "left": 2, "right": 3）- Step：步伐- Width：宽度- Height：高度- Timer：影响步伐滚动速度- DelayTime：延时时间- WaitTime：初始化时的等待时间- ScrollStep：卷页步伐*****************************************************************/function Marquee(obt) {  if (obt == null || obt == "") {    return;  }  this.ID = document.getElementById(obt.ID);  if (!this.ID) {    alert("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 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 = "<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;  }}

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