Question

js图片轮换问题，怎么能让轮换循环呢？

<SCRIPT>
var widths=1344;
var heights=242;
var counts=5;
img1=new Image ();img1.src='images/head/1.jpg';
img2=new Image ();img2.src='images/head/2.jpg';
img3=new Image ();img3.src='images/head/3.jpg';
img4=new Image ();img4.src='images/head/4.jpg';

url1=new Image ();url1.src='#';
url2=new Image ();url2.src='#';
url3=new Image ();url3.src='#';
url4=new Image ();url4.src='#';
var nn=1;
var key=0;
function change_img()
{if(key==0){key=1;}
else if(document.all)
{document.getElementById("pic").filters[0].Apply();document.getElementById("pic").filters[0].Play(duration=2);}
eval('document.getElementById("pic").src=img'+nn+'.src');
eval('document.getElementById("url").href=url'+nn+'.src');
for (var i=1;i<=counts;i++){document.getElementById("xxjdjj"+i).className='axx';}
document.getElementById("xxjdjj"+nn).className='bxx';
nn++;if(nn>counts){nn=1;}
tt=setTimeout('change_img()',4000);}
function changeimg(n){nn=n;window.clearInterval(tt);change_img();}
document.write('<style>');
document.write('.axx{padding:1px 7px;border-left:#cccccc 1px solid;}');
document.write('a.axx:link,a.axx:visited{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#666;}');
document.write('a.axx:active,a.axx:hover{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#999;}');
document.write('.bxx{padding:1px 7px;border-left:#cccccc 1px solid;}');
document.write('a.bxx:link,a.bxx:visited{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#D34600;}');
document.write('a.bxx:active,a.bxx:hover{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#D34600;}');
document.write('</style>');
document.write('<div style="width:'+widths+'px;height:'+heights+'px;overflow:hidden;text-overflow:clip;">');
document.write('<div><a id="url" target="_blank"><img id="pic" style="border:0px;filter:progid:dximagetransform.microsoft.wipe(gradientsize=1.0,wipestyle=4, motion=forward)" width='+widths+' height='+heights+' /></a></div>');
//document.write('<div style="filter:alpha(style=1,opacity=10,finishOpacity=80);background: #888888;width:100%-2px;text-align:right;top:-12px;position:relative;margin:1px;height:12px;padding:0px;margin:0px;border:0px;">');
for(var i=1;i<counts+1;i++){document.write('<a href="javascript:changeimg('+i+');" id="xxjdjj'+i+'" class="axx" target="_self">'+i+'</a>');}
document.write('</div></div>');
change_img();
</SCRIPT>

Answer 1

<SCRIPT>
var widths=1344;
var heights=242;
var counts=4; /// 这里写错了，图片只有4张，数量写了5，轮换到第五张不存在的图片时JS出错停止执行了
img1=new Image ();img1.src='images/head/1.jpg';
img2=new Image ();img2.src='images/head/2.jpg';
img3=new Image ();img3.src='images/head/3.jpg';
img4=new Image ();img4.src='images/head/4.jpg';

url1=new Image ();url1.src='#';
url2=new Image ();url2.src='#';
url3=new Image ();url3.src='#';
url4=new Image ();url4.src='#';
var nn=1;
var key=0;
function change_img()
{if(key==0){key=1;}
else if(document.all)
{document.getElementById("pic").filters[0].Apply();document.getElementById("pic").filters[0].Play(duration=2);}
eval('document.getElementById("pic").src=img'+nn+'.src');
eval('document.getElementById("url").href=url'+nn+'.src');
for (var i=1;i<=counts;i++){document.getElementById("xxjdjj"+i).className='axx';}
document.getElementById("xxjdjj"+nn).className='bxx';
nn++;if(nn>counts){nn=1;}
tt=setTimeout('change_img()',4000);}
function changeimg(n){nn=n;window.clearInterval(tt);change_img();}
document.write('<style>');
document.write('.axx{padding:1px 7px;border-left:#cccccc 1px solid;}');
document.write('a.axx:link,a.axx:visited{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#666;}');
document.write('a.axx:active,a.axx:hover{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#999;}');
document.write('.bxx{padding:1px 7px;border-left:#cccccc 1px solid;}');
document.write('a.bxx:link,a.bxx:visited{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#D34600;}');
document.write('a.bxx:active,a.bxx:hover{text-decoration:none;color:#fff;line-height:12px;font:9px sans-serif;background-color:#D34600;}');
document.write('</style>');
document.write('<div style="width:'+widths+'px;height:'+heights+'px;overflow:hidden;text-overflow:clip;">');
document.write('<div><a id="url" target="_blank"><img id="pic" style="border:0px;filter:progid:dximagetransform.microsoft.wipe(gradientsize=1.0,wipestyle=4, motion=forward)" width='+widths+' height='+heights+' /></a></div>');
//document.write('<div style="filter:alpha(style=1,opacity=10,finishOpacity=80);background: #888888;width:100%-2px;text-align:right;top:-12px;position:relative;margin:1px;height:12px;padding:0px;margin:0px;border:0px;">');
for(var i=1;i<counts+1;i++){document.write('<a href="javascript:changeimg('+i+');" id="xxjdjj'+i+'" class="axx" target="_self">'+i+'</a>');}
document.write('</div></div>');
change_img();
</SCRIPT>

Answer 2

function changeSrc(nIndex){
var imageList = new Array();
imageList.push("1.jpg");
imageList.push("2.jpg");

var obj = document.getElementById("imagecontain");
obj.src = imageList[nIndex%imageList.length];
}

<div><img id="imagecontain" src="1.jpg" /></div>
<script>
var nIndex = 1;
objTimer = window.setInterval(function(){
changeSrc(nIndex);
nIndex++;
},1000);
document.getElementById("imagecontain").onmousemove = function(){
clearInterval(objTimer)
}
document.getElementById("imagecontain").onmouseout = function(){
objTimer = window.setInterval(function(){
changeSrc(nIndex);
nIndex++;
},1000);
}
</script>
</body>