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> <p id = "box"> <p 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> <p id = "fixpoint"></p> <p id = "hourhand"></p> <p id = "minutehand"></p> <p id = "secondhand"></p> </p> </p> <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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以上就是h5+c3实现时钟效果的详细内容。