<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
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// var num=1;
// setInterval(function(){
// //console.log(document.getElementById("f_img").src);
// document.getElementById("f_img").src="http://127.0.0.1:8020/ch04/img/0"+num+".jpg"
//
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// /*
window.onload=function(){
var num=0 ;
setInterval(function(){
/*alert("hahahah");*/
//console.log(document.getElementById("f_img").src);
document.getElementById("f_img").src="http://127.0.0.1:8020/ch04/img/0"+(num++)+".jpg";
if(num>3){
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/* setTimeout(function(){alert("Hello")},1000); */
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<body>
<img id="f_img" src="img/01.jpg" />
</body>
<script >
window.onload=function(){
var a=1;
setInterval(function(){
document.getElementById("f_img").src="http://127.0.0.1:8020/ch04/img/0"+(a++)+".jpg"
/*
a++;*/
if(a>3){
a=1;
}
},500);
}
</script>
</html>
