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63.在屏幕打出时间.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>在屏幕打出当前时间</h1>
<hr>
<div id="nowDate"></div>
<script>
    function printNowDate() {
        now = new Date();
        h = now.getHours();
        m = now.getMinutes();
        s = now.getSeconds();
        m = shufficNum(m);
        s =shufficNum(s);
        document.getElementById("nowDate").innerHTML="nowDate is :"+h+":"+m+":"+s;
        //document.write("nowDate is :"+h+":"+m+":"+s);
        next=setTimeout(function () {
                printNowDate();
            }
            ,1000);
    }
    now=printNowDate();
            function shufficNum(num) {
        if (num <10){
            num="0"+num;
        }
        return num;
    }
</script>
</body>
</html>