这里有新鲜出炉的 Javascript 教程,程序狗速度看过来!
Javascript 是一种由 Netscape 的 LiveScript 发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如 Perl,遗留的速度问题,为客户提供更流畅的浏览效果。
这篇文章主要介绍了基于 Marquee.js 插件实现的跑马灯效果, 结合实例形式给出了 Marquee.js 插件的定义及具体使用方法, 需要的朋友可以参考下
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:
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 = "<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;
- }
- }
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
- });
- }
希望本文所述对大家 JavaScript 程序设计有所帮助。
来源: http://www.phperz.com/article/17/0611/328142.html