js数字滑动时钟的简单实现(示例讲解)

废话不多说，直接上代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    body,ul{margin:0;padding: 0;}
    .content{margin:100px auto;width: 1000px;}
    .box{position: relative;float: left;width: 50px;height: 120px;overflow: hidden;}
    .box li{position: absolute;left: 0;width:100%;height: 120px;list-style:none;font-size:80px;font-weight: bold;background-color: #fff; line-height: 120px; text-align: center;}
    .colon{float: left;height: 120px;font-size: 80px;color: #e91e63;font-weight: bold;line-height: 100px;}
  </style>
</head>
<body>
  <div class="content">
  </div>
  <script type="text/javascript">
  (function(){
    var colors = ["#69D2E7", "#E20049", "#19215E", "#F38630", "#FA6900", "#FF4E50", "#F9D423", "#FFB6FF", "#474168", "#6ACAFC"];
    var content = document.querySelector('.content');
    var num = 0;
    var height = 120;
    var maxheight = (2-num)*height;
    var timeNum = [3,10,6,10,6,10];
    var position = [];
    var NumberBoxs = [];
    for(var i =0;i<10;i++){
      position.push((1-i)*height);
    };
    function NumberBox() {}
    NumberBox.prototype = {
      init : function () {
        var innerHTML = "<div class='box' id='box"+num+"'><ul>"
        this.num = num;
        num++;
        for(var i =0,l=timeNum[this.num];i<l;i++){
          innerHTML += "<li style='color:"+colors[i]+"'>"+i+"</li>";
        }
        innerHTML += "</ul><div>"
        content.innerHTML += innerHTML;
        if(num==2||num==4){content.innerHTML += "<div class='colon'>:</div>"}
      },
      dominit : function(){
        this.Ali = [].slice.call(document.getElementById('box'+this.num).getElementsByTagName('li'),0);
        this.Ali.forEach(function(dom,i){
          dom.style.top = position[i] + "px";
          dom.style.transition = "top .8s";
        })
        this.hasdom = true;
      },
      toNum : function (n) {
        if(!this.hasdom){this.dominit();}
        n = ""+n;
        var p = this;
        var l = p.Ali.length-1;
        while(p.Ali[1].innerHTML!=n){
        p.Ali.unshift(p.Ali.pop());
        }
        p.Ali.forEach(function (dom,i) {
        dom.style.zIndex = (i==l)?"-1":"1";
        dom.style.top = position[i] + "px";
        })
      }
    }
    for(var i=0;i<6;i++){
      var o = new NumberBox();
      o.init();
      NumberBoxs.push(o);
    }
    function getTime() {
      var time = new Date();
      return (""+Fixed2(time.getHours())+Fixed2(time.getMinutes())+Fixed2(time.getSeconds())).split("");
    }
    function Fixed2(n){
      return Number(n)<10?"0"+n:n;
    }
    (function () {
      var time = getTime();
      NumberBoxs.forEach(function(obj,i){
        obj.toNum(time[i]);
      });
      setTimeout(arguments.callee,1000);
    })()
  })();
  </script>
</body>
</html>

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