H5+C3实现时钟效果

互联网 18-3-27

这次给大家带来H5+C3实现时钟效果，H5+C3实现时钟效果的注意事项有哪些，下面就是实战案例，一起来看一下。

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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