<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
/*overflow:hidden的作用是隐藏溢出,超出设置的宽高后自动隐藏*/
#tab { overflow:hidden; position:relative; float:left;}
/*img里面的第一个元素外的元素都设置为*/
#tab>img:not(:first-child){ display:none; }
</style>
<script>
window.onload = function(){
var images = document.getElementsByTagName('img');
console.log(images)
var pos = 0;
var len = images.length;
setInterval(function(){
images[pos].style.display = 'none';
pos = ++pos == len ? 0 : pos;
images[pos].style.display = 'inline';
},1000);
};
</script>
</head>
<body>
<div id="tab">
<img src="./img/1.jpg" />
<img src="./img/2.jpg" />
<img src="./img/3.jpg" />
</div>
</body>
</html>