基于HTML5+CSS3实现简单的时钟效果

目的：

利用html5，css实现钟摆效果

知识点：

1）利用position/left/top和calc()实现元素的水平和垂直居中；

2）利用CSS3的animation/transform/transform-origin属性定义动画；

3）利用transform-origin实现旋转原点的圆心调整

废话不多说了，直接看代码吧，具体代码如下所示：

<!DOCTYPE html><html><head>    <meta charset="UTF-8">    <title></title>    <style>        li{            list-style:none;        }        #box{            width: 400px;            height: 400px;            position: absolute;            top:calc(50% - 200px);            left:calc(50% - 200px);            border: 2px solid palegoldenrod;        }        #dial{            width: 200px;            height: 200px;            position: absolute;            top:calc(50% - 100px);            left:calc(50% - 100px);            border: 2px solid cyan;            border-radius: 50%;        }           .scaleIndex{            width: 4px;            height: 12px;            position: absolute;            top: 0;            left: calc(50% - 2px);            background-color: gray;            transform-origin: 2px 100px;        }        .angle30{transform : rotate(30deg);}        .angle60{transform : rotate(60deg);}        .angle90{transform : rotate(90deg);}        .angle120{transform : rotate(120deg);}        .angle150{transform : rotate(150deg);}        .angle180{transform : rotate(180deg);}        .angle210{transform : rotate(210deg);}        .angle240{transform : rotate(240deg);}        .angle270{transform : rotate(270deg);}        .angle300{transform : rotate(300deg);}        .angle330{transform : rotate(330deg);}        #fixPoint{            width: 10px;            height: 10px;            position: absolute;            top:calc(50% - 5px);            left:calc(50% - 5px);            background-color: cadetblue;            border-radius: 50%;        }        #hourHand{            width: 6px;            height: 70px;            position:absolute;            top: 40px;            left: calc(50% - 3px);            background-color: darkblue;            transform-origin: 50% 60px;        }        #minuteHand{            width: 4px;            height: 75px;            position:absolute;            top: 35px;            left: calc(50% - 2px);            background-color: yellow;            transform-origin: 50% 65px;        }        #secondHand{            width: 2px;            height: 90px;            position:absolute;            top: 20px;            left: calc(50% - 1px);            background-color: red;            transform-origin: 50% 80px;        }    </style></head><body>    <div id = "box">            <div id = dial>                <ul id = "scale">                    <li class = "scaleIndex"></li>                    <li class = "scaleIndex angle30"></li>                    <li class = "scaleIndex angle60"></li>                    <li class = "scaleIndex angle90"></li>                    <li class = "scaleIndex angle120"></li>                    <li class = "scaleIndex angle150"></li>                    <li class = "scaleIndex angle180"></li>                    <li class = "scaleIndex angle210"></li>                    <li class = "scaleIndex angle240"></li>                    <li class = "scaleIndex angle270"></li>                    <li class = "scaleIndex angle300"></li>                    <li class = "scaleIndex angle330"></li>                </ul>                <div id = "fixPoint"></div>                <div id = "hourHand"></div>                <div id = "minuteHand"></div>                <div id = "secondHand"></div>            </div>        </div><script type = text/javascript src = js/jquery-3.2.1.js></script><script type = "text/javascript">window.onload = function(){            var hourHand = document.getElementById(hourHand);            var minuteHand = document.getElementById(minuteHand);            var secondHand = document.getElementById(secondHand);setInterval(function(){                    var currentTime = new Date();                    var hourValue = currentTime.getHours();                    var hourAngle = hourValue / 24 * 360 + deg;                    var minuteValue = currentTime.getMinutes();                    var minuteAngle = minuteValue / 60 * 360 + deg;                    var secondValue = currentTime.getSeconds();                    var secondAngle = secondValue / 60 * 360 + deg;                    console.log(hourAngle);// 方法一：利用jquery的css()增加属性var cmdHour = rotate(+ hourAngle +);$(#hourHand).css({transform:rotate(+ hourAngle +)});var cmdMinute = rotate(+ minuteAngle +);$(#minuteHand).css({transform:cmdMinute});var cmdSecond = rotate(+ secondAngle +);$(#secondHand).css({transform:cmdSecond});// 方法二：利用DOM元素的style属性设置//      hourHand.style.transform = rotate(+ hourAngle + );//      minuteHand.style.transform = rotate(+ minuteAngle + );//      secondHand.style.transform = rotate(+ secondAngle + );  },1000);}    </script></body></html>

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基于HTML5+CSS3实现简单的时钟效果