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如下所示：
複製代碼 代碼如下:
<!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>
<title></title>
<style type="text/css">
#main{border:1px solid black; width:200px;margin:0px auto;padding:100px;}
</style>
<script type="text/javascript">
window.onload = function () {
//第一種調用方法，傳遞的是方法指標
//setInterval(showMsg, 1000);
//第二種調用方法
var methodName = "showMsg()"; //注意這裡使用了字串，並且加了括弧
setInterval(methodName, 1000); //加了雙引號，表示裡面是代碼，會執行裡面的代碼類似於setInterval("alert('a')",1000),每隔1秒執行alert('a')
}
var seconds = 5;
function showMsg() {
if (seconds > 0) {
seconds--;
document.getElementById("msg").innerHTML = seconds + "秒鐘後自動關閉！";
}
else {
window.close();
}
}
</script>
</head>
<body>
<div id="main">
這是廣告表單:
<div id="msg">5秒鐘後自動關閉！</div>
</div>
</body>
</html>
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