JS-实现秒表倒计时+缓存倒计时

约定不等于承诺〃 2022-05-17 12:38 388阅读 0赞

实现秒表倒计时+缓存倒计时功能

<!DOCTYPE html>
    <html>
    
        <head>
            <meta charset="UTF-8">
            <title></title>
        </head>
    
        <body>
            <p class="diffDate"></p>
            <p class="counterSecond"></p>
        </body>
        <script type="text/javascript"> countTime(); function countTime() { var date = new Date(); var now = date.getTime(); var date2 = new Date(); //倒计时10天 date2.setDate(date2.getDate() + 10); var d, h, m, s, ms; //从本地获取保存的时间 var leftTime = ''; var cacheDate = localStorage.getItem( "counter"); if(cacheDate) { //缓存有值 leftTime = new Date(parseInt(cacheDate)).getTime() - 1000; //更新缓存 localStorage.setItem("counter", leftTime); } //如果没有缓存或时间过期 if(!cacheDate || leftTime < 0) { leftTime = date2.getTime() - now; //保存最后时间 localStorage.setItem("counter", leftTime - 1000); } if(leftTime >= 0) { d = Math.floor(leftTime / 1000 / 60 / 60 / 24 % 31); h = Math.floor(leftTime / 1000 / 60 / 60 % 24); m = Math.floor(leftTime / 1000 / 60 % 60); s = Math.floor(leftTime / 1000 % 60); ms = Math.floor(leftTime % 1000); if(d < 10) { d = "0" + d; } if(h < 10) { h = "0" + h; } if(m < 10) { m = "0" + m; } if(s < 10) { s = "0" + s; } } //console.log(d + ":" + h + ":" + m + ":" + s + ":" + ms) document.getElementsByClassName("diffDate")[0].innerHTML = d + ":" + h + ":" + m + ":" + s; } setInterval(countTime, 1000); var diffCount = 0; /** * 从0到100计数 */ function countMilSecond() { ++diffCount; if(diffCount >= 100) { diffCount = 0; } if(diffCount < 10) { diffCount = '0' + diffCount; } document.getElementsByClassName("counterSecond")[0].innerHTML = diffCount; } setInterval(countMilSecond, 10); </script>
    
    </html>

效果：  
![这里写图片描述][70]

[70]: /images/20220517/bded7c10d87c49ef8a9d4ca7df3d689f.png