本文实例讲述了基于Marquee.js插件实现的跑马灯效果。分享给大家供大家参考，具体如下：
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1、Marquee.js文件
/****************************************************************
- 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 = "| 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;
}
}
2、脚本调用
window.onload = function() {
new Marquee({ ID: "scrollNews", Direction: "top", Step: 2, Width: 0, Height: 80, Timer: 50, DelayTime: 1000, WaitTime: 1000, ScrollStep: 80 });
}
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希望本文所述对大家JavaScript程序设计有所帮助。
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