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How to use JS+setInterval to implement a timer

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Release： 2018-06-02 15:55:44
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This time I will show you how to use JS setInterval to implement a timer. What are the precautions for using JS setInterval to implement a timer? The following is a practical case, let's take a look.

Use

setInterval to implement timing, and advance one to the minute after 60 seconds, and advance one to the hour after 60 minutes. 

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title> JS计时器</title>
    <script>
      window.onload = function(){
      var mm = 0;
      var ss = 0;
      var str = '';
      var timer = setInterval(function(){
      str = "";
      if(++ss==60)
      {
      if(++mm==60)
      {
      mm=0;
      }
      ss=0;
      }
      str+=mm<10?"0"+mm:mm;
      str+=":";
      str+=ss<10?"0"+ss:ss;
      document.getElementById("d").innerHTML = str;
      },1000);
      };
    </script>
  </head>
  <body>
  <p id="d"></p>
  </body>
</html>
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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

How to use Vue to implement a countdown button

How to use Vue to write a two-way data binding

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Related labels：
javascript timer
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