最最简单的图片轮播效果

var imgs=["img/1.jpg","img/2.jpg","img/3.jpg","img/4.jpg"];
var img=new Image();
img.src=imgs[0];
img.onload=function () {
$("#ad").append(img);
};
var index=0;
setInterval(function () {
$("#ad").html("");
index++;
if(index>=imgs.length){
index=0;
}
img.src=imgs[index];
img.onload=function(){
$("#ad").append(img);
}
},1000)