js 走馬燈

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="https://www.w3.org/1999/xhtml">

<head>

    <title>走馬燈</title>

    <script type="text/javascript">

   

   var direction ='left';

   var intervalId = window.setInterval(function () {

       if (direction == 'right') {

           var title = document.title;

           var firstchar = title.charAt(0);

           var lastchar = title.substring(1, title.length);

           document.title = lastchar + firstchar;

       }

       if (direction == 'left') {

           var title = document.title;

           var firstchar = title.charAt(title.length – 1);

           var lastchar = title.substring(0, title.length – 1);

           document.title = firstchar + lastchar;

       }

   }, 2000)

    </script>

</head>

<body>

</body>

</html>

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