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>