js计数器 

<!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;
  function startCount() {
    document.getElementById('count').value=num;
    num=num+1;
    setTimeout("startCount()",1000);
     
  }
  
</script>
</head>
<body>
<form>
<input type="text" id="count" onclick="startCount()"/>
</form>
</body>
</html>

实现数字自动增长。

 

 

增加start和stop控制按钮

<!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>

 

posted @ 2017-02-03 11:45  超级学渣渣  阅读(6954)  评论(0)  编辑  收藏  举报