js实现时间与当前日期

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8"/>
    <title>Document</title>
</head>
<body onload="time()">
    <span id="clock">
    </span>
</body>
    <script language="javascript">
        function time() {
            var today = new Date();
            var hou;
            var time;
            var day;
            if (today.getHours() < 12 && today.getHours() >= 0) {
                hou = today.getHours();
                time = "AM";
            } else if (today.getHours() <= 24 && today.getHours() > 12) {
                hou = today.getHours() - 12;
                time = "PM";
            }
            var d = today.getDay();
            if (d == 0) {
                day = "日";
            } else if (d == 1) {
                day = "一";
            } else if (d == 2) {
                day = "二";
            } else if (d == 3) {
                day = "三";
            } else if (d == 4) {
                day = "四";
            } else if (d == 5) {
                day = "五";
            } else if (d == 6) {
                day = "六";
            }
            document.getElementById("clock").innerHTML = (today.getFullYear() + "年" + (today.getMonth() + 1) + "月" + today.getDate() + "日&nbsp;" + hou + ":" + today.getMinutes() + ":" + today.getSeconds() + "&nbsp;" + time + "&nbsp;星期" + day);
        }
        var myTime = setInterval("time()", 1000);
    </script>
</html>
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