setInterval(getNowTime, 1000);

function getNowTime() {
    var noon;
    var time = new Date();
    var hour = time.getHours();
    var minute = time.getMinutes();
    var seconds = time.getSeconds();
    var today = new Date;
    var week = new Array(7);
    week[0] = "<font color=#FF0000>星期天</font>";
    week[1] = "星期一";
    week[2] = "星期二";
    week[3] = "星期三";
    week[4] = "星期四";
    week[5] = "星期五";
    week[6] = "<font color=#FF0000>星期六</font>";
    if (hour < 5) noon = "凌晨";
    if (hour > 4 & hour < 8) noon = "早晨";
    if (hour > 7 & hour < 12) noon = "上午";
    if (hour == 12) noon = "中午";
    if (hour > 12 & hour < 19) noon = "下午";
    if (hour > 18 & hour < 23) noon = "晚上";
    if (hour > 22) noon = "深夜";
    if (hour > 12) hour = hour - 12;
    if (hour < 10) hour = "0" + hour;
    if (minute < 10) minute = "0" + minute;

    var doc = document.getElementsByClassName("time")[0];
    var html = "";
    html += "<span>";
    html += today.getFullYear() + "年" + (today.getMonth() + 1) + "月" + today.getDate() + "日 " + week[today.getDay()] + "  " + noon + " " + hour + ":" + minute + ":" + (seconds < 10 ? ("0" + seconds) : seconds);
    html += "</span>";

    doc.innerHTML = html;
}