<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>百宝箱工作室IT微课堂 http://www.baibaox.com</title>
<script>
var c=1;
var t;
var timer_is_on=0;
function timedCount(){
document.getElementById('text').value=c;
c=c+1;
t=setTimeout("timedCount()",1000);
}
function doTimer(){
if (!timer_is_on)
{
timer_is_on=1;
timedCount();
}
}
</script>
</head>
<body>
<form>
<input type="button" value="点击我开始计数" onClick="doTimer()">
<input type="text" id="text">
</form>
<p>单击按钮，输入框将从1开始一直计数。</p>
</body>
</html>
