BOM学习-javascript计时器小结

Posted 2020-10-10

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>自动增长计时器</title>
<script type="text/javascript">
  var atime;
  function clock(){
    var time=new Date();          
    atime=time.getHours()+":"+time.getMinutes()+":"+time.getSeconds();
    document.getElementById("clock").value = atime;
  }
 setInterval(clock,1000); 
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50"  style="background:#000;color:#00ff00;width:55px"; />
</form>
</body>
</html>

效果：

技术分享

显示当前时间，自动增长

添加按钮的计时器（用于开始和暂停）

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>

<script type="text/javascript">
  var num=0;
  var i;
  function startCount(){
    document.getElementById(‘count‘).value=num;
    num=num+1;
    i=setTimeout("startCount()",1000);
  }
  function stopCount(){
  clearTimeout(i);
  }
</script>
</head>
<body>
  <form>
    <input type="text" id="count" />
    <input type="button" value="Start" onclick="startCount()"/>
    <input type="button" value="Stop"  onclick="stopCount()" />
  </form>
</body>
</html>