HTML+CSS3+JavaScript实现动态数字时钟-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_42795087/article/details/134533212

前端HTML+CSS3+JavaScript实现动态时钟

一、实现思路概述
二、源代码(包含HTML、CSS、JS)
三、图片资源与效果截图
- 1. 图片资源
- 2. 效果截图

一、实现思路概述

 1. 通过HTML搭建基本时钟的页面结构(这里将时钟图片资源作为背景图）
 2. 将时钟背景和时/分/秒图片进行CSS位置居中放置
 3. 通过JS按以下步骤实现动态刷新时钟页面
 	- 获取时钟、时、分、秒标签
 	- 获取当前日期，并初始化时分秒变量
 	- 定义时钟的时、分、秒进位逻辑函数
 	- 初始化闹钟(设置时分秒指针旋转角度)，显示闹钟
 	- 设置定时器间隔1秒刷新一次时、分、秒指针角度

二、源代码(包含HTML、CSS、JS)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>数字时钟</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        #clock{
            width: 600px;
            height: 600px;
            margin: 50px auto;
            background-image: url("./images/clock.jpg");
            position: relative;
            display: none;
        }
        #hour, #minute, #second{
            width: 30px;
            height: 600px;
            position: absolute;
            left: 50%;
            margin-left: -15px;
        }
        #hour{
             background-image: url("./images/hour.png");
        }
        #minute{
            background-image: url("./images/minute.png");
        }
        #second{
            background-image: url("./images/second.png");

        }
    </style>
</head>
<body>
    <div id="clock">
        <div id="hour"></div>
        <div id="minute"></div>
        <div id="second"></div>
    </div>
    <script>
        var clock = document.getElementById('clock');
        var secondPointer = document.getElementById('second');
        var minutePointer = document.getElementById('minute');
        var hourPointer = document.getElementById('hour');
        var now = new Date();
        var second = now.getSeconds(), minute = now.getMinutes(), hour = now.getHours() % 12;
        var secondAngle = 0, minuteAngle = 0, hourAngle = 0;

        function setClock(){
            second += 1;
            if(second === 60){
                second = 0;
                minute += 1;
                if(minute === 60){
                    minute = 0;
                    hour += 1;
                    if(hour === 12){
                        hour = 0;
                    }
                }
            }
            secondAngle = second * 6;
            minuteAngle = minute * 6 + second / 60;
            hourAngle = hour * 30 + minute / 60 + second / 3600;

            secondPointer.style.transform = `rotate(${secondAngle}deg)`;
            minutePointer.style.transform = `rotate(${minuteAngle}deg)`;
            hourPointer.style.transform = `rotate(${hourAngle}deg)`;
        }
        // 初始化时钟
        setClock();
        clock.style.display = 'block';

        setInterval(setClock, 1000);
    </script>
</body>
</html>