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@@ -0,0 +1,49 @@
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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: #aaa;
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+ box-shadow: 0 0 10px rgba(0,0,0,.5);
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+ border-radius: 10px;
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+ position: fixed;
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+ top:50%;
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+ left:50%;
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+ margin-left: -150px;
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+ margin-top: -150px;
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+ text-align: center;
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+ line-height: 300px;
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+ font-size: 40px;
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+ font-weight: 500;
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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>10</span>
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+ </div>
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+ <script>
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+ var oSpan = document.getElementsByTagName("span");
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+ var num = 10;
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+
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+ var setObj = setInterval(function(){
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+ if(num == 0){
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+ clearInterval(setObj);
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+ }
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+ oSpan[0].innerText = num--;
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+ },1000);
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+
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+
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+
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+ // oSpan[0].innerText = "hello world";
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+
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+ // var arr = [1,2,3,4]
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+ // arr[0] = "a"
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+ </script>
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+</body>
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+</html>
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