js实现支付倒计时返回首页 -

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>

<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>

<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>`