支持IE和FireFox的滚动图片javascript

优快云首页的图片滚动是基于.NET的JS框架完成的，本来想直接引用，后来发现那个JS有点大，涉及到的垃圾很多，现在的代码都流行框架，都是一体的功能很多，但是定制起来非常困难，像我这种喜欢了解原理和喜欢简单的人不适合~下面是我找来简单修改了一下的图片渐变过渡效果！要实现上下拉幕方式只能暂等了~后面我实现了再帖过来，呵呵。Demo地址：http://www.yofun.cn/guide/zcool/index.html

/**/ /***********************************************
* Ultimate Fade-In Slideshow (v1.5): ? Dynamic Drive (http://www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
*     Modified by Wilson Chen, http://Yofun.cn, 2007-7-11
***********************************************/
 
var  fadebgcolor = " white "
 
// //NO need to edit beyond here/////////////
 
var  fadearray = new  Array()  // array to cache fadeshow instances
var  fadeclear = new  Array()  // array to cache corresponding clearinterval pointers
 
var  dom = (document.getElementById)  // modern dom browsers
var  iebrowser = document.all
 
function  fadeshow(theimages, fadewidth, fadeheight, borderwidth, delay, pause, displayorder)
... {
    this.pausecheck=pause
    this.mouseovercheck=0
    this.delay=delay
    this.degree=10 //initial opacity degree (10%)
    this.curimageindex=0
    this.nextimageindex=1
    fadearray[fadearray.length]=this
    this.slideshowid=fadearray.length-1
    this.canvasbase="canvas"+this.slideshowid
    this.curcanvas=this.canvasbase+"_0"
    if (typeof displayorder!="undefined")
        theimages.sort(function() ...{return 0.5 - Math.random();}) //thanks to Mike (aka Mwinter) :)
    this.theimages=theimages
    this.imageborder=parseInt(borderwidth)
    this.postimages=new Array() //preload images
    this.rotatetimer = null
    for(p=0;p<theimages.length;p++)
    ...{
        this.postimages[p]=new Image()
        this.postimages[p].src=theimages[p][0]
    }
     var fadewidth=fadewidth+this.imageborder*2
    var fadeheight=fadeheight+this.imageborder*2
 
    if(iebrowser&&dom||dom) //if IE5+ or modern browsers (ie: Firefox)
        document.write('<div id="master'+this.slideshowid+'" style="position:relative;width:'+fadewidth+'px;height:'+fadeheight+'px;overflow:hidden;"><div id="'+this.canvasbase+'_0" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;-khtml-opacity:10;background-color:'+fadebgcolor+'"></div><div id="'+this.canvasbase+'_1" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;background-color:'+fadebgcolor+'"></div></div>')
    else
        document.write('<div><img name="defaultslide'+this.slideshowid+'" src="'+this.postimages[0].src+'"></div>')
 
    if (iebrowser&&dom||dom) //if IE5+ or modern browsers such as Firefox
        this.startit()
    else
    ...{
        this.curimageindex++
        setInterval("fadearray["+this.slideshowid+"].rotateimage()", this.delay)
    }
}

function  fadepic(obj)
... {
    if(obj.degree<100)
    ...{
        obj.degree+=10
        if(obj.tempobj.filters&&obj.tempobj.filters[0])
        ...{
            if(typeof obj.tempobj.filters[0].opacity=="number") //if IE6+
                obj.tempobj.filters[0].opacity=obj.degree
            else //else if IE5.5-
                obj.tempobj.style.filter="alpha(opacity="+obj.degree+")"
        }
        else if(obj.tempobj.style.MozOpacity)
            obj.tempobj.style.MozOpacity=obj.degree/101
        else if (obj.tempobj.style.KhtmlOpacity)
            obj.tempobj.style.KhtmlOpacity=obj.degree/100
    }
    else
    ...{
        clearInterval(fadeclear[obj.slideshowid])
        obj.nextcanvas=(obj.curcanvas==obj.canvasbase+"_0")? obj.canvasbase+"_0" : obj.canvasbase+"_1"
        obj.tempobj=iebrowser? iebrowser[obj.nextcanvas] : document.getElementById(obj.nextcanvas)
        obj.populateslide(obj.tempobj, obj.nextimageindex)
        obj.nextimageindex=(obj.nextimageindex<obj.postimages.length-1)? obj.nextimageindex+1 : 0
        obj.rotatetimer = setTimeout("fadearray["+obj.slideshowid+"].rotateimage()", obj.delay)
    }
}

fadeshow.prototype.populateslide = function (picobj, picindex)
... {
    var slideHTML=""
    if(this.theimages[picindex][1]!="") //if associated link exists for image
        slideHTML='<a href="'+this.theimages[picindex][1]+'" target="'+this.theimages[picindex][2]+'">'
    slideHTML+='<img src="'+this.postimages[picindex].src+'" border="'+this.imageborder+'px">'
    if(this.theimages[picindex][1]!="") //if associated link exists for image
        slideHTML+='</a>'
    picobj.innerHTML=slideHTML
}
 
fadeshow.prototype.rotateimage = function ()
... {
    this.rotatetimer = null
    if(this.pausecheck==1) //if pause onMouseover enabled, cache object
        var cacheobj=this
    if(this.mouseovercheck==1)
        this.rotatetimer = setTimeout(function()...{cacheobj.rotateimage()}, 100)
    else if (iebrowser&&dom||dom)
    ...{
        this.fadelock = true;
        this.resetit()
        var crossobj=this.tempobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
        crossobj.style.zIndex++
        fadeclear[this.slideshowid]=setInterval("fadepic(fadearray["+this.slideshowid+"])",50)
        this.curcanvas=(this.curcanvas==this.canvasbase+"_0")? this.canvasbase+"_1" : this.canvasbase+"_0"
    }
    else
    ...{
        var ns4imgobj=document.images['defaultslide'+this.slideshowid]
        ns4imgobj.src=this.postimages[this.curimageindex].src
    }
    this.curimageindex=(this.curimageindex<this.postimages.length-1)? this.curimageindex+1 : 0
}

fadeshow.prototype.showimage = function (idx)
... {
    if(idx > this.postimages.length-1)
    ...{
        alert("index out of range");
        return;
    }
    this.nextimageindex=idx;
    this.curimageindex=idx;
    if(this.rotatetimer != null)
    ...{
        clearTimeout(this.rotatetimer);
        this.nextcanvas=(this.curcanvas==this.canvasbase+"_0")? this.canvasbase+"_0" : this.canvasbase+"_1"
        this.tempobj=iebrowser? iebrowser[this.nextcanvas] : document.getElementById(this.nextcanvas)
        this.populateslide(this.tempobj, this.nextimageindex)
        this.rotateimage();
    }
    else
    ...{
    }
}

fadeshow.prototype.resetit = function ()
... {
    this.degree=10
    var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
    if (crossobj.filters&&crossobj.filters[0])
    ...{
        if (typeof crossobj.filters[0].opacity=="number") //if IE6+
            crossobj.filters(0).opacity=this.degree
        else //else if IE5.5-
            crossobj.style.filter="alpha(opacity="+this.degree+")"
    }
    else if (crossobj.style.MozOpacity)
        crossobj.style.MozOpacity=this.degree/101
    else if (crossobj.style.KhtmlOpacity)
        crossobj.style.KhtmlOpacity=obj.degree/100
}
 
 
fadeshow.prototype.startit = function ()
... {
    var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
    this.populateslide(crossobj, this.curimageindex)
    if (this.pausecheck==1)//IF SLIDESHOW SHOULD PAUSE ONMOUSEOVER
    ...{
        var cacheobj=this
        var crossobjcontainer=iebrowser? iebrowser["master"+this.slideshowid] : document.getElementById("master"+this.slideshowid)
        crossobjcontainer.onmouseover=function()...{cacheobj.mouseovercheck=1}
        crossobjcontainer.onmouseout=function()...{cacheobj.mouseovercheck=0}
    }
    this.rotateimage()
}

调用 如下：

 

< div  id ="flash_show" >
     < div  id ="flash_img" >
     < script  type ="text/javascript" > ...
var fadeimages=new Array()
//SET IMAGE PATHS. Extend or contract array as needed
fadeimages[0]=["01.jpg", "http://guide.yofun.cn/", "_new"]
fadeimages[1]=["02.jpg", "http://yofun.cn/guide/0/page6.html", "_new"]
fadeimages[2]=["03.jpg", "http://yofun.cn/guide/0/page6.html", "_new"]
fadeimages[3]=["04.jpg", "http://yofun.cn/guide/0/page4.html", "_new"]
var fadeobj = new fadeshow(fadeimages, 180, 180, 0, 3000, 1)
</ script >
< div  style ="padding-top:2px; position:absolute; top:150px; width:180px;"  align ="right" >
     < a  href ="javascript:fadeobj.showimage(0);" >< img  src ="advimages/flash_btn_1.gif"  border ="0" ></ a >
     < a  href ="javascript:fadeobj.showimage(1);" >< img  src ="advimages/flash_btn_2.gif"  border ="0" ></ a >
     < a  href ="javascript:fadeobj.showimage(2);" >< img  src ="advimages/flash_btn_3.gif"  border ="0" ></ a >
     < a  href ="javascript:fadeobj.showimage(3);" >< img  src ="advimages/flash_btn_4.gif"  border ="0" ></ a >
</ div >
</ div >