Marquee.js实现跑马灯效果

淩亂°似流年 2021-09-16 05:36 734阅读 0赞

Marquee.js实现跑马灯效果

**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 });
    }