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var l=0;
var imgs;
var sum=0;
var imgs=new Array();
function chk(){
l--;
document.getElementById("aa").innerText=""+((sum-l)*100/sum)+"%"
if (l==0){
for (var i=0;i<sum;i++)
document.body.innerHTML+="<img src='"+imgs[i].src+"'>"
}
}
if (document.images){
imgs[0]=new Image()
imgs[1]=new Image()
imgs[2]=new Image()
imgs[3]=new Image()
imgs[4]=new Image()
imgs[5]=new Image()
imgs[6]=new Image()
imgs[7]=new Image()
imgs[0].src=http://www.chinahtml.com/0608/"/articleimg/2006/08/3859/01.jpg";
imgs[1].src=http://www.chinahtml.com/0608/"/articleimg/2006/08/3859/02.jpg";
imgs[2].src=http://www.chinahtml.com/0608/"/articleimg/2006/08/3859/03.jpg";
imgs[3].src=http://www.chinahtml.com/0608/"/articleimg/2006/08/3859/04.jpg";
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imgs[5].src=http://www.chinahtml.com/0608/"/articleimg/2006/08/3859/06.jpg";
imgs[6].src=http://www.chinahtml.com/0608/"/articleimg/2006/08/3859/07.jpg";
imgs[7].src=http://www.chinahtml.com/0608/"/articleimg/2006/08/3859/08.jpg";
}
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<body>
<div id="aa">0%</div>
<script>
sum=l=imgs.length;
for (var i=0;i<l;i++){
imgs[i].onload=chk;
imgs[i].onerror=chk;//无论图片是否加载成功，都执行指定方法
}
</script>
</body>
