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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