网页防刷新倒计时实现-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_41323619/article/details/103740093

本文介绍如何在网页中实现防止用户刷新页面时倒计时重置的技术方案，确保倒计时的连续性。

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防刷新倒计时

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="/spa/lib/js/jquery-3.3.1.min.js"></script>
    <title>Document</title>
</head>

<body>
<p id="ip"></p>分<p id="ip1"></p>秒
<script>
    $(function() {
        console.log("1")
        var p = document.getElementById("ip");
        var p1 = document.getElementById("ip1");
        var sum;
        var tmer;
        let time = localStorage.getItem("time")
        localStorage.clear()
        console.log("2")
        if (time == null || time == undefined) {
            sum = 120
            console.log("3")
            tm()
        } else {
            console.log("4")
            sum = time
            tm()
        }
        function format(a)
        {
            return a.toString().replace(/^(\d)$/,'0$1');
        }
        function tm() {
            console.log("5")
            tmer = setTimeout(tm, 1000)
            sum--;
            p.innerHTML = format(parseInt(sum / 60));
            p1.innerHTML = format(parseInt(sum % 60));
            localStorage.setItem("time", sum)
            if (sum < 1) {
                localStorage.clear()
                clearTimeout(tmer)
            }


        }
    });
</script>
</body>

</html>