• javascript 秒表计时器


    随手写个js计时器,非常简单的,但是一些逻辑处理感觉还是有点怪怪的...

    不知道怎么把那个时间格式显示为00:00:00:00的样子,使用checkTime() 将会产生一大串0,is anybody help me ?

    效果如下图

      1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
      2 <html xmlns="http://www.w3.org/1999/xhtml">
      3 <head>
      4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
      5 <title>简单的计时器</title>
      6 </head>
      7 
      8 <body>
      9 <input type="button" id="start" onclick="startTime()" value="开始计时"/>
     10 <input type="button" id="stop" onclick="stopTime()" value="停止"/>
     11 <input type="button" onclick="clearTime()" value="清零"/>
     12 <p id="showTime">00 : 00 : 00 : 00</p>
     13 <script>
     14     var ms = 0;
     15     var secs = 0;
     16     var mins = 0;
     17     var hours = 0;
     18     var timeoutId;
     19 
     20 var isCounting = false;    
     21 
     22 function startTime()
     23 {    
     24     if(!isCounting)
     25     {
     26         isCounting = true;
     27         timeoutId = setInterval(countTime,1);        //指定时间执行任务
     28     }
     29 
     30     document.getElementById("start").value = "计时中";
     31 }
     32 
     33 function stopTime()
     34 {
     35     if(isCounting)
     36     {
     37         isCounting = false;
     38         clearTimeout(timeoutId); //清除指定id计时器
     39         document.getElementById("start").value = "继续";
     40     }
     41 }
     42 
     43 function countTime()
     44 {
     45     ms+=1;
     46     if(ms>=100)
     47     {
     48         secs+=1;
     49         ms = 0;
     50     }
     51     if(secs>=60)
     52     {
     53         mins+=1;    
     54         secs = 0;
     55     }
     56     if(mins>=60)
     57     {
     58         hours+=1;
     59         mins = 0;    
     60     }
     61     if(hours>=24)
     62     {
     63         hours = 0;
     64     }
     65     
     66 //    ms = checkTime(ms);
     67 //    secs = checkTime(secs);
     68 //    mins = checkTime(mins);
     69 //    hours = checkTime(hours);
     70         
     71         
     72     document.getElementById("showTime").innerHTML = hours + " : " + mins + " : " + secs + " : " + ms;
     73 }
     74 
     75 function checkTime(time)
     76 {
     77     if(time<10)
     78         time = "0"+time;
     79     
     80     return time;
     81 }
     82 function resetTime()
     83 {
     84     ms = 0;
     85     secs = 0;
     86     mins = 0;
     87     hours = 0;        
     88     
     89 }
     90 function clearTime()
     91 {
     92     resetTime();
     93     document.getElementById("showTime").innerHTML = hours + " : " + mins + " : " + secs + " : " + ms;
     94     if(!isCounting)
     95         document.getElementById("start").value = "开始计时";
     96 }
     97 
     98 
     99 </script>
    100 </body>
    101 </html>
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  • 原文地址:https://www.cnblogs.com/act262/p/3977425.html
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