另一个简单的计时
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>滴答编程(dida100.com)</title>
</head>
<head>
<script>
function timedText(){
var x=document.getElementById('txt');
var t1=setTimeout(function(){x.value="2 秒"},2000);
var t2=setTimeout(function(){x.value="4 秒"},4000);
var t3=setTimeout(function(){x.value="6 秒"},6000);
}
</script>
</head>
<body>
<form>
<input type="button" value="显示文本时间!" onclick="timedText()" />
<input type="text" id="txt" />
</form>
<p>点击上面的按钮，输出的文本将告诉你2秒，4秒，6秒已经过去了。</p>
</body>
</html>