js+SVG实现动态时钟效果

  • Z时代
  • 2024-01-10
  • 分类：综合

本文实例为大家分享了js+SVG实现动态时钟效果展示的具体代码，供大家参考，具体内容如下

<!DOCTYPE HTML>
<html>
<meta charset="utf-8">
<head>
<title>Analog Clock</title>
<script>
function updateTime() { 
 var now = new Date();      // 当前时间
 var min = now.getMinutes();     // 分钟
 var hour = (now.getHours() % 12) + min/60; // 转行成可以在时钟上表示的时间
 var seconds = now.getSeconds();    //秒钟
 var minangle = min*6;      // 6度表示一分钟
 var hourangle = hour*30;     // 30 表示一小时
 var secrangel = seconds * 6;    // 6度表示一秒钟
 // 获取表示时钟时针的SVG元素
 var minhand = document.getElementById("minutehand");
 var hourhand = document.getElementById("hourhand");
 var secondhand = document.getElementById("secondhand");
 // 设置这些元素的SVG属性，将它们移动到钟面上
 minhand.setAttribute("transform", "rotate(" + minangle + ",50,50)");
 hourhand.setAttribute("transform", "rotate(" + hourangle + ",50,50)");
 secondhand.setAttribute("transform", "rotate(" + secrangel + ",50,50)");
 // 每秒钟更新下时钟显示时间
 setTimeout(updateTime, 1000);
}
</script>
<style>
#clock {       
 stroke: black;     
 stroke-linecap: round;   
 fill: #eef;     
}
#face { stroke-width: 2px;}  
#ticks { stroke-width: 2px; }  
#hourhand {stroke-width: 3px;} 
#minutehand {stroke-width: 2px;} 
#secondhand{stroke-width: 1px;}
#numbers {      
 font-family: sans-serif; font-size: 7pt; font-weight: bold; 
 text-anchor: middle; stroke: none; fill: black;
}
</style>
</head>
<body onload="updateTime()">
 <!-- viewBox是坐标系，width和height是指屏幕大小 -->
 <svg id="clock" viewBox="0 0 100 100" width="500" height="500"> 
 <defs> <!-- 定义下拉阴影的滤镜 -->
  <filter id="shadow" x="-50%" y="-50%" width="200%" height="200%">
  <feGaussianBlur in="SourceAlpha" stdDeviation="1" result="blur" />
  <feOffset in="blur" dx="1" dy="1" result="shadow" />
  <feMerge>
   <feMergeNode in="SourceGraphic"/><feMergeNode in="shadow"/>
  </feMerge>
  </filter>
 </defs>
 <circle id="face" cx="50" cy="50" r="45"/> <!-- 钟缅 -->
 <g id="ticks">        <!-- 12小时的刻度 -->
  <line x1='50' y1='5.000' x2='50.00' y2='10.00'/>
  <line x1='72.50' y1='11.03' x2='70.00' y2='15.36'/>
  <line x1='88.97' y1='27.50' x2='84.64' y2='30.00'/>
  <line x1='95.00' y1='50.00' x2='90.00' y2='50.00'/>
  <line x1='88.97' y1='72.50' x2='84.64' y2='70.00'/>
  <line x1='72.50' y1='88.97' x2='70.00' y2='84.64'/>
  <line x1='50.00' y1='95.00' x2='50.00' y2='90.00'/>
  <line x1='27.50' y1='88.97' x2='30.00' y2='84.64'/>
  <line x1='11.03' y1='72.50' x2='15.36' y2='70.00'/>
  <line x1='5.000' y1='50.00' x2='10.00' y2='50.00'/>
  <line x1='11.03' y1='27.50' x2='15.36' y2='30.00'/>
  <line x1='27.50' y1='11.03' x2='30.00' y2='15.36'/>
 </g>
 <g id="numbers">      <!-- 标记重要的几个刻度值-->
  <text x="50" y="18">12</text><text x="85" y="53">3</text>
  <text x="50" y="88">6</text><text x="15" y="53">9</text>
 </g>
 <!-- 初始绘制成竖直的指针，之后通过js来做旋转 -->
 <g id="hands" filter="url(#shadow)"> <!-- 给指针添加阴影 -->
  <line id="hourhand" x1="50" y1="50" x2="50" y2="25"/>
  <line id="minutehand" x1="50" y1="50" x2="50" y2="18"/>
  <line id="secondhand" x1="50" y1="50" x2="50" y2="11"/>
 </g>
 </svg>
</body>
</html>

更多JavaScript时钟特效点击查看：JavaScript时钟特效专题

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