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>总结
以上所述是小编给大家介绍的基于HTML5+CSS3实现简单的时钟效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网页设计网站的支持！
