1.计时方法
1）setInterval() -间隔指定的毫秒数不停地执行指定的代码
clearInterval() -停止setInterval()方法执行的函数代码
2）setTimeout() -暂停指定的毫秒数后执行指定的代码 (递归)
clearTimeOut()
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
</head>
<body>
<button onclick="stopTime()">an</button>
<p id="pid"></p>
<script type="text/javascript">
var mytime = setInterval(function(){
getTime();
},1000);
function getTime(){
var d = new Date();
var t = d.toLocaleString();
document.getElementById("pid").innerHTML = t;
}
function stopTime(){
clearInterval(mytime);
}
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
</head>
<body onload="myWin()">
<button onclick="stopWin()">an</button>
<p id="pid"></p>
<script type="text/javascript">
var win;
function myWin(){
alert("hello");
win = setTimeout(function(){myWin()},3000);
}
function stopWin(){
clearTimeout(win);
}
</script>
</body>
</html>