3秒后自动跳转页面【js】

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
</head>
<body>
       <div class="block">
            <span>提交成功<span id="code">3</span>秒后跳转到指定页面</span>
       </div>
</body>
<script type="text/javascript">
        function count(){
            obj=document.getElementById('code');
            s=3;
            setInterval(function(){
               obj.innerHTML=s--;
               if(s==0){
                  window.location.href='http://www.baidu.com';
               }
            },1000);
        }
    count();
</script>
</html>

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