JavaScript-定时器

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="i1">实打实的阿斯顿请问请问</div>

<script>
        function f1(){
           var tag =document.getElementById('i1');
            tag.innerText;
          var content =tag.innerText;
          var  f=content.charAt(0);
          var  l=content.substring(1,content.length);
          var  new_content= l + f;
            tag.innerText = new_content;
        }
        setInterval('f1()',1000)
</script>
</body>
</html>
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原文地址：https://www.cnblogs.com/fuyuteng/p/9406366.html