<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="i2">欢迎马老师到来，观察做出指导。</div>
<input id="i1" style=" 80px;" value="欢迎马老师到来，观察做出指导。" >
<script type="application/javascript">
content = document.getElementById("i1").getAttribute("value")
setInterval("gun()",1000)
var i = 0
function gun() {
document.getElementById("i1").setAttribute("value",content.substring(i,i+6))
i++
if ( i == content.length - 6){
i = 0
}
}
</script>
<script>
setInterval("gun2()",500);
function gun2() {
var tag = document.getElementById('i2');
var content = tag.innerText;
f = content.charAt(0);
l = content.substring(1,content.length);
new_content = l + f;
tag.innerText = new_content;
}
</script>
</body>
</html>