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来自 , 2021-02-20, 写在 JavaScript, 查看 133 次.
URL http://www.code666.cn/view/0e141831
  1. <html>
  2. <head>
  3. <title>Javascript clock</title>
  4. <head>
  5. <style type="text/css">
  6.  form,label
  7.  {
  8.    font-family:arial, sans-serif, helvetica, "times new roman";
  9.    font-size:10pt; /* increase or decrease the value to change the size of the font */
  10.  }
  11.  h1
  12.  {
  13.    font-family:arial, sans-serif, helvetica, "times new roman";
  14.  }
  15. </style>
  16.  
  17.       <script type="text/javascript">
  18.        <!-- hide the code from old browsers that do not support javascript
  19.  
  20.         /*
  21.            Original: daniusr
  22.  
  23.  
  24.              You are welcomed to modify this script to your needs.
  25.          
  26.            This script retrieves the time from the internal system clock,
  27.            so it is up to you to make sure the time is accurate or correct.
  28.         */
  29.  
  30.  
  31.         function clock()
  32.         {
  33.            var today = new Date();
  34.            var hours = today.getHours();
  35.            var minutes = today.getMinutes();
  36.            var seconds = today.getSeconds();
  37.            var time_holder; // holds the time
  38.  
  39.              //if the first radio button is checked display 12-hours format time
  40.              if(timeForm.stime[0].checked)
  41.              {
  42.                 // add "AM" or "PM" if the 12-hours format is chosen
  43.                 var ampm = ((hours >= 12) ? " PM" : " AM");    
  44.                
  45.                 // convert the hour to 12-hours format
  46.                 // javascript returns midnight as 0, but since the time is in the 12-hours format
  47.                 // force javascript to return 12
  48.                 hours = ((hours == 0) ? "12" : (hours > 12) ? hours - 12 : hours);
  49.                
  50.                 // add a leading zero if less than 10
  51.                 minutes = ((minutes < 10) ? "0" + minutes : minutes);
  52.                 seconds = ((seconds < 10) ? "0" + seconds : seconds);
  53.                
  54.                 time_holder = hours + ":" + minutes + ":" + seconds + ampm;
  55.  
  56.                  document.getElementById('jsClock').innerHTML =  time_holder;
  57.              }
  58.              if(timeForm.stime[1].checked)
  59.              {
  60.                // add a leading zero if less than 10
  61.                hours = ((hours < 10) ? "0" + hours : hours);
  62.                minutes = ((minutes < 10) ? "0" + minutes : minutes);
  63.                seconds = ((seconds < 10) ? "0" + seconds : seconds);
  64.  
  65.                time_holder = hours + ":" + minutes + ":" + seconds;
  66.            
  67.                document.getElementById('jsClock').innerHTML = time_holder;
  68.              }
  69.  
  70.            
  71.            if((!timeForm.stime[0].checked) && (!timeForm.stime[1].checked))
  72.            {
  73.              
  74.              document.getElementById('jsClock').innerHTML = "Please select a time format.";
  75.            }
  76.  
  77.            
  78.            // keep the clock ticking
  79.            setTimeout("clock()", 1000);
  80. }
  81. // end hiding -->
  82. </script>
  83. </head>
  84.  
  85. <body onload="javascript:clock()">
  86.  
  87.  
  88.     <h1 id="jsClock" style="margin:0" align="center"></h1>
  89.  
  90.   <form name="timeForm" style="margin:0">
  91.     time format:
  92.     <label for="ci"><input type="radio" name="stime" id="ci">12-hours format</label>
  93.     <label for="mi"><input type="radio" name="stime" id="mi">24-hours format</label>
  94.   </form>
  95.  
  96.  
  97. </body>
  98. </html>
  99. //javascript/6193

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