<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>jstest</title>
</head>
<body>
<div id = "a1">
jstest
</div>
<script>
function func()
{
var tag = document.getElementById("a1");
var content = tag.innerText;
f = content.charAt(0);
l = content.substring(1,content.length);
newcontent = l + f;
tag.innerHTML = newcontent;
}
setInterval("func()",100);
</script>
</body>
</html>
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