<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>jsTime.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function count(){
setTimeout("alert('hello,world');", 7000); //7秒后执行前面的语句(一次)
}
</script>
</head>
<body>
<input type="button" value="定时器" onclick="count()">
</body>
</html>
第二种方式：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>jsTime2.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
<script type="text/javascript">
var num = 0;
var interval = setInterval("count();",1000); //重复执行表达式
function count(){
document.getElementById("counter").innerHTML = num++;
}
function stop(){
clearInterval(interval); //终止定时器
alert("停止计时");
}
</script>
</head>
<body>
<div id="counter">0</div>
<input type="button" value="停止计时" onclick="stop();" >
</body>
</html>
