支付倒计时返回首页案例简介：在首页绑定一个按钮跳转到另一个页面，用到了简单的js语法，getElementsByTagName、location.href等。
index.html
效果图如下:
`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.wrapper{
background-color:aquamarine;
width: 300px;
height: 300px;
margin: 0 auto;
}
h2{
text-align: center;
}
button{
text-align: center;
margin-left: 68px;
}
</style>
</head>
<body>
<div class="wrapper">
<h2>商品:smile</h2>
<h2>价格:infinity</h2>
<h2>支付方式:Net</h2>
<h2>订单号:123456789</h2>
<button>取消</button>
<button>支付</button>
</div>
<script>//逻辑:点击支付按钮进行跳转页面//获得第二个(第一个是0)标签名为'button'的标签添加点击事件并且绑定一个函数document.getElementsByTagName('button')[1].onclick = function(){//跳转前的确认框let res = window.confirm('请确认支付');//判断是否为真,为真跳转if(res){//直接使用目录下的html页面,也可输入其他网站链接location.href = "./return.html"}}</script>
</body>
</html>return.html<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.wrapper{
width: 300px;
height: 400px;
margin: 0 auto;
}
.content{
text-align: center;
}
</style>
</head>
<body>
<div class="wrapper">
<div class="content">
<h2>支付成功</h2>
<span id="countDown">10</span>秒后返回首页
<button>立即返回</button>
</div>
</div>
<script>//逻辑:页面打开,开始倒计时window.onload = function(){//先赋值let timer = 10;//倒计时//箭头函数()=>{} == function(){}setInterval(()=>{timer--;document.getElementById('countDown').innerText = timer;//等于0时跳转首页if(timer==0){location.href = "./index.html"}},1000);}//点击按钮立即返回首页document.getElementsByTagName('button')[0].onclick = function(){location.href = "./index.html"}</script>
</body>
</html>`
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