js定时器的例子

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>定时器</title><script type="text/javascript">  var timer = null;    function begin() {  var date = new Date();  var current_time = date.getFullYear() + '-' +  date.getMonth() + '-' + date.getDate() + ' ';  current_time += date.getHours() + ':' + date.getMinutes() + ':' + date.getSeconds();  document.getElementById('current_time').value = current_time;  timer = setTimeout('begin()', 1000);  }    function end() {  clearTimeout(timer);  //清除掉定时器对象  }  </script></head><body>   <input type="text" name="current_time" id="current_time"/><input type="button" value="开始" onclick="begin();">   <input type="button" value="结束" onclick="end();"/><br/></body></html>