JavaScript 자동 스케줄 By Pun22

8. 自動排程 功能
WS000018.JPG

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"></meta>
    <title>自動排程 Schedule</title>
    <script type="text/javascript">
    //alert("hello");
    // 一秒鐘之後 排程動作的基本
    // setTimeout only執行一次countdown 倒數
    // setInterval 每秒鐘執行一次countdown 倒數
    var timer;
    function init(){
        timer = document.getElementById("timer");
        //window.setInterval(countdown,1000);
        window.setInterval(countdown,1000);
    }
    function countdown(){
        timer.innerHTML = timer.innerHTML-1;
        if(timer.innerHTML > 0){
        //window.setTimeout(countdown,1000);
        }else{
        document.location="http://www.sina.com";
        }
    }
    </script>
</head>
<body onload = "init();">
    <span id = "timer">3</span>
</body>
</html>

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