<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
#ul1{
margin: 100px auto 0;
padding: 0;
}
li{
float: left;
margin: 0 0 10px 10px;
list-style: none;
border: 1px solid black;
}
img{
width: 300px;
height: 200px;
display: block;
}
</style>
<script>
window.onload=function(){
var oUl=document.getElementById("ul1");
var aImg=oUl.getElementsByTagName("img");
showImage();
window.onscroll=showImage;
function showImage(){
//滚动条滚动的高度
var scrollTop=document.documentElement.scrollTop || document.body.scrollTop;
for(var i=0;i<aImg.length;i++){
if( !aImg[i].isLoad && getTop(aImg[i])<scrollTop+document.documentElement.clientHeight){
//alert(i);
aImg[i].src=aImg[i].getAttribute("_src");
aImg[i].isLoad=true;
}
}
}
function getTop(obj){
var iTop=0;
while(obj){
iTop+=obj.offsetTop;
obj=obj.offsetParent;
}
return iTop;
}
}
</script>
</head>
<body>
<ul id="ul1">
<li>
<img _src="img/1.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/2.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/3.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/4.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/5.png" src="img/7.png" />
</li>
<li>
<img _src="img/6.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/1.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/2.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/3.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/4.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/5.png" src="img/7.png" />
</li>
<li>
<img _src="img/6.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/1.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/2.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/3.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/4.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/5.png" src="img/7.png" />
</li>
<li>
<img _src="img/6.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/1.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/2.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/3.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/4.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/5.png" src="img/7.png" />
</li>
<li>
<img _src="img/6.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/1.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/2.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/3.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/4.jpg" src="img/7.png" />
</li>
<li>
<img _src="img/5.png" src="img/7.png" />
</li>
<li>
<img _src="img/6.jpg" src="img/7.png" />
</li>
</ul>
</body>
</html>
图片的按需加载
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转载自www.cnblogs.com/gxywb/p/10240784.html
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