图片轮播的几个小程序？

图片轮播

window.setInterval("Huan()",4000);

var n = document.getElementsByClassName('ysd1').length-1;

var d =0;

function Huan()

{

var attr = document.getElementsByClassName('ysd1');

d++;

if(d>n)

{

d = 0;

}

for(var i=0;i<=n;i++)

{

attr[i].style.display = "none";

}

attr[d].style.display = "block";

}

带箭头的轮播

var sy = 0;

var zd = document.getElementsByClassName('yz1').length-1;

function Huan()

{

var attr = document.getElementsByClassName('yz1');

for(var i=0;i<attr.length;i++)

{

attr[i].style.display="none";

}

attr[sy].style.display = "block";

}

function aaaa()

{

if(sy>1)

{

sy=sy-1;

}

else

{

sy = zd;

}

Huan();

}

function bbbb()

{

if(sy<zd)

{

sy=sy+1;

}

else

{

sy=0;

}

Huan();

}