js timer

<html><head lang="en">

    <meta charset="UTF-8">

    <title></title>

    <style>

        img{

            display: none;

        }

        div{

           font-size: 200px;

           color: red;

        }

    </style>

</head>

<body>

  <img class="icon" src="img/thy.jpg" style="display: inline-block;">

  <div class="time" style="display: none;"></div>

  <script>

   var timer = setInterval(function(){

        var div = document.getElementsByClassName('time')[];

        div.innerHTML = div.innerHTML - ;

        if(div.innerHTML == ''){

            // 清除计时器

              clearInterval(timer);

            // 隐藏div

               div.style.display = 'none';

            // 显示图片

               var img = document.getElementsByClassName('icon')[];

               img.style.display = 'inline-block';

        }

     }, );

  </script>

</body></html>
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