JS图片根据鼠标滚动延时加载的实例代码

functionlazyload(option){
   varsettings={
defObj:null,
defHeight:0
   };
   settings=$.extend(settings,option||{});
   vardefHeight=settings.defHeight;
   vardefObj=(typeofsettings.defObj=="object")?settings.defObj.find("img"):$(settings.defObj).find("img");
   varpageTop=function(){
returndocument.documentElement.clientHeight+Math.max(document.documentElement.scrollTop,document.body.scrollTop)-settings.defHeight;
   };
   varimgLoad=function(){
defObj.each(function(){
   if($(this).offset().top<=pageTop()){
       varsrc2=$(this).attr("src2");
//已显示的不用再显示
if(src2){
                   //显示后，去掉src2属性
   $(this).attr("src",src2).removeAttr("src2");
}
           }
});
   };
   imgLoad();
   $(window).bind("scroll",function(){
       imgLoad();
   });
}
lazyload({
   defObj:".w1"
});