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@@ -0,0 +1,42 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .box{
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+ width: 300px;
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+ height: 300px;
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+ background-color: #999;;
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+ position: fixed;
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+ top: 50%;
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+ left: 50%;
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+ margin-top: -150px;
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+ margin-left: -150px;
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+ color: #fff;
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+ font-weight: bold;
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+ font-size: 50px;
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+ text-align: center;
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+ line-height: 300px;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="box">
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+ <span class="num">10</span>
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+ </div>
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+ <script>
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+ var i = 10;
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+ var oNum = document.getElementsByClassName("num")[0];
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+ var timer = setInterval(function(){
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+ i--;
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+ console.log(i);
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+ oNum.innerText = i;
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+ if(i==0){
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+ clearInterval(timer);
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+ }
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+ },1000)
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+ </script>
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+</body>
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+</html>
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