我要评论目的：
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
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