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    DEDECMS广告轮换代码(幻灯效果)
    POST TIME:2017-12-29 23:06

    作用:

    广告轮换

    效果:

    本站(571免费空间:http://www.571free.com/)头部中间图片广告

    优势:

    每5秒切换一次,一个广告位展现N个广告

    大大提高了广告位置的利用率

    且广告处于动态方式,实时更换,更吸引人。

    劣势:

    网页需要多加载3个图片,不过对于GIF格式的图片,实在说不上是大,对于网页速度的影响还是有限的

    代码展现:

     

     <script LANGUAGE="javascript">
    <!--
    var cpAD=new Array(); 
    var cpADlink=new Array(); 
    var cpADmsg=new Array(); 
    //定义了5个数组
    var adNum=5; 
    var coll=0;

    //ad/1.html 那时你链接的广告地址

    cpAD[0]="/banners/ad/1.gif"; 
    cpADlink[0]="http://count.chanet.com.cn/click.cgi?a=294504&d=131883&u=&e="; 
    cpADmsg[0]="1";

    cpAD[1]="/banners/ad/2.gif"; 
    cpADlink[1]="http://count.chanet.com.cn/click.cgi?a=294504&d=18290&u=&e="
    cpADmsg[1]="2";

    cpAD[2]="/banners/ad/3.gif"; 
    cpADlink[2]="http://count.chanet.com.cn/click.cgi?a=294504&d=37894&u=&e="; 
    cpADmsg[2]="3";

    var preloadedimages=new Array(); 
    for (i=1;i<cpAD.length;i++){ 
    preloadedimages[i]=new Image(); 
    preloadedimages[i].src=cpAD[i]; 
    }

    //跳转的URL地址
    function jump2url()

    jumpUrl=cpADlink[adNum]; 
    jumpTarget='_blank'; 
    if (jumpUrl != '')

            if (jumpTarget != '')
                    window.open(jumpUrl,jumpTarget); 
            else location.href=jumpUrl; 
            } 
    }

    //图片变化的函数
    function changeimg(n)
    {
            adNum=n;
            switch(adNum)
            {
            case 0:
            {
                    window.img1.src="banners/1-2.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
            case 1:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2-2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
            case 2:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3-2.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
                    case 3:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4-2.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
                    case 4:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5-2.gif";
                    break;
            }
            }
            window.clearInterval(theTimer);
            adNum=adNum-1;
            nextAd();
    }
    //当点击时直接跳转
    function nextAd(){ 
    coll++;
    if(coll>1)
    {
    switch(adNum+1)
    {
            case 5:
            {
                    window.img1.src="banners/1-2.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
            case 1:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2-2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
            case 2:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3-2.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
            case 3:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4-2.gif";
                    window.img5.src="banners/5.gif";
                    break;
            }
        case 4:
            {
                    window.img1.src="banners/1.gif";
                    window.img2.src="banners/2.gif";
                    window.img3.src="banners/3.gif";
                    window.img4.src="banners/4.gif";
                    window.img5.src="banners/5-2.gif";
                    break;
            }
    }
    }
    if(adNum<cpAD.length-1)adNum++ ; 
    else adNum=0; 
    setTransition(); 
    document.images.cpADrush.src=cpAD[adNum]; 
    playTransition(); 
    displayStatusMsg();
    //定义了轮换时间 5s
    theTimer=setTimeout("nextAd()", 5000); 
    }

     

    
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