function fun(){$(".productimg").each(function() {//遍历所有图片var othis = $(this),//当前图片对象top = othis.offset().top - $(window).scrollTop();//计算图片top - 滚动条topif (top > $(window).height()) {//如果该图片不可见return;//不管} else {othis.attr('src', othis.attr('data-src')).removeAttr('data-src');//可见的时候把占位值替换 并删除占位属性
        }});
}
fun();
//$window.scroll(fn).resize(fn);//绑定事件
$(window).bind("scroll",function(){
fun();// 判断窗口的滚动条是否接近页面底部if( $(document).scrollTop() + $(window).height() > $(document).height() - 10 ) {$.ajax({
ulr:"../mainpage/default.aspx",
data:"id=1",
dataType:"html",
type:"post",
success:function(data,status){
var ss="";
for(var i=0;i<2;i++)
{ss+="<div class='divRow'>";for(var j=0;j<4;j++){ss+="<a href='../product/product.aspx' target='_blank'><img class='productimg' data-src='../image/051.jpg' src='http://s0.husor.cn/image/blank.png' >"+"<div class='divMask'></div>"+"<div class='divToolTip'>【包邮】华为荣耀3X</div>"+"<div class='divProMsg'>"+"<span class='spanPrice'><b class='bFH'>￥</b><b class='bY'>30</b><b class='bSH'>.99</b></span>"+"<span class='spanCX'><span class='spanCXXX'>5.0折</span> "+"<span class='spanYJ'><strike>￥50.50</strike></span></span><span class='spanQG'>546人已开抢</span>"+"<span class='spanQQG'><b>去抢购</b></span></div></a>";}ss+="</div>"
}$(".div_ajax").append(ss);},
error: function(xmlHttp,status,msg){
$(".div_ajax").html("append");
}
});

             <div class="div_ajax"><%for (int i = 0; i < RowCount; i++){ %><div class="divRow"><%for (int j = 0; j < ColCount; j++){ %><a href='../product/product.aspx' target='_blank'><img class='productimg' data-src='../image/05.jpg' src='http://s0.husor.cn/image/blank.png' alt='sadfsafsadff'><div class='divMask'></div><div class='divToolTip'>【包邮】华为荣耀3X</div><div class='divProMsg'><span class='spanPrice'><b class='bFH'>￥</b> <b class='bY'>30</b> <b class='bSH'>.99</b></span><span class='spanCX'><span class='spanCXXX'>5.0折</span> <span class='spanYJ'><strike>￥50.50</strike></span> </span><span class='spanQG'>546人已开抢</span> <span class='spanQQG'><b>去抢购</b></span></div></a><%} %></div><div class='divFGX'></div><%} %></div>

.productimg
{ width:100%; height:220px;border:0px;margin-top:0px;position:relative;background:url('../image/loading.gif') no-repeat center center;
}