JS practice——clock effect

<!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>
        *{
            margin: 0;
            padding: 0;
        }
        span{
            display: inline-block;
            height: 50px;
            width: 50px;
            background-color: black;
            color: white;
            line-height: 50px;
            text-align: center;
        }
    </style>
</head>
<body>
    <div>
        <span class="hour">1</span>
        <span class="minute">2</span>
        <span class="sec">3</span>
    </div>
    <script>
        let hour=document.querySelector(".hour")
        let minute=document.querySelector(".minute")
        let second=document.querySelector(".sec")
        // 引入元素
        let date=+new Date()
        // 总毫秒数
       function getnowtime(date){
        // 函数
        h=parseInt(date/1000/60/60%24)
        h=h>10? h:"0"+h
        // 三元表达式 作用是在数字前加0
        m=parseInt(date/1000/60%60)
        m=m>10? m:"0"+m
        s=parseInt(date/1000%60)
        s=s>10? s:"0"+s
        // 获取了时分秒 不确定可以在控制台先打印看看
        // console.log(date)
        // console.log(s);
        // console.log(m);
        // console.log(h);
       }
       getnowtime(date)
    //    运行函数
       hour.innerHTML=h
       minute.innerHTML=m
       second.innerHTML=s
    //   赋值
       time1=setInterval(function(){
        // 定时器
        let date=+new Date()
        getnowtime(date)
        // 运行函数
        hour.innerHTML=h
       minute.innerHTML=m
       second.innerHTML=s
    //    赋值
       },1000)
       
    //    console.log(date);
    </script>
</body>
</html>
JS practice——clock effect

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