javascript 时钟

<script type="text/javascript">
    function clock() {
        now = new Date();
        year = now.getFullYear();
        month = now.getMonth() + 1;
        day = now.getDate();

        today = ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'];
        week = today[now.getDay()];

        hour = now.getHours();
        min = now.getMinutes();
        sec = now.getSeconds();
        if (hour < 10) {
            hour = "0" + hour;
        }
        if (min < 10) {
            min = "0" + min;
        }
        if (sec < 10) {
            sec = "0" + sec;
        }
        $("#curTime").html(
            year + "年" + month + "月" + day + "日" + "  " + week + " " + hour + ":" + min + ":" + sec
        );
    }

    setInterval(clock, 1000);
</script>