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@@ -0,0 +1,63 @@
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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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+ box-shadow: 0 0 10px rgba(0,0,0.5);
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+ background-color: #aaa;
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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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+ }
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+ .btn{
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+ width: 100px;
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+ height: 40px;
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+ line-height: 40px;
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+ margin:0 auto;
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+ border:1px solid #666;
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+ cursor: pointer;
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+ }
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+ .box h1{
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+ margin-top: 100px;
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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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+ <h1>100</h1>
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+ <div class="btn">开始</div>
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+ </div>
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+
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+ <script>
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+ var oH1 = document.getElementsByTagName("h1")[0];
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+ var oBtn = document.getElementsByClassName("btn")[0];
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+ var time = null;
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+ var isPlay = false;
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+ oBtn.onclick = function(){
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+ if(isPlay){
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+ //暂停状态
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+ this.innerText = "开始";
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+ isPlay = false;
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+ clearInterval(timer);
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+ }else{
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+ //开始状态
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+ isPlay = true;
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+ this.innerText = "暂停";
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+ timer = setInterval(function(){
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+ oH1.innerText = parseInt(oH1.innerText)-1
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+ },1000)
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+ }
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+
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+ }
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+ </script>
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+</body>
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+</html>
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