页面显示时间----最简

<html lang="en">
<head>
    <meta charset="UTF-8">
    <script src="jquery-3.1.0.js"></script>
    <title></title>
    <style>
        div{
            text-align: center;
            margin-top: 100px;
            font-size: 30px;
        }
    </style>
</head>
<body>

<div>20:20:20</div>

<script>
  $(function () {
      var div = document.querySelector('div')
      function time1 () {
          var now = new Date()
          div.innerHTML = now.toTimeString().substring(0, 9)
      }
      time1()
      setInterval(time1,1000)
  })
</script>
</body>
</html>
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原文地址：https://www.cnblogs.com/-khj/p/6272364.html