<html>
<head>
<meta charset="utf-8" />
<title></title>
<script>
window.onload=function(){
setInterval("rollImg()",2000);
}
var imgarr=["https://img.uj5u.com/2020/09/26/104296261136251.jpg",
"https://www.w3school.com.cn/i/eg_chinarose.jpg",
"https://www.runoob.com/images/pulpit.jpg"]
var i = 1;
function rollImg(){
i++;
if(i == 4){
i = 1;
}
var img_id = document.getElementById("img_id");
img_id.src= https://www.cnblogs.com/blogsky-520/p/imgarr[i-1];
}
</script>
<body>
