JS代码实现
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<head>
<script>
function timedText(){
var x=document.getElementById('txt');
var i=1;
var t1=setInterval(function(){x.value=i++ + "秒过去了"},1000);
}
</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……秒已经过去了。</p>
</body>
</html>