js显示实时时间，兼容谷歌火狐浏览器

在页面加载时运行showtime()；

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  var timerID = null
    function MakeArray(size) {
        this.length = size;
        for (var i = 1; i <= size; i++) {
            this[i] = "";
        }
        return this;
    }

    function showtime() {
        var userAgent = navigator.userAgent.toLowerCase();
        //判断是否为google的浏览器 
        var chrome = /chrome/.test(userAgent);
    
        var now = new Date();
        var year = now.getYear();
        if ($.browser.mozilla || chrome) {
            year += 1900;
        }
        var month = now.getMonth() + 1;
        var date = now.getDate();
        var hours = now.getHours();
        var minutes = now.getMinutes();
        var seconds = now.getSeconds();
        var day = now.getDay();
        Day = new MakeArray(7);
        Day[0] = "星期天";
        Day[1] = "星期一";
        Day[2] = "星期二";
        Day[3] = "星期三";
        Day[4] = "星期四";
        Day[5] = "星期五";
        Day[6] = "星期六";
        var timeValue = "";
        timeValue += year + "年" + "  ";
        timeValue += ((month < 10) ? "0" : "") + month + "月" + "  ";
        timeValue += date + "日 " + "  ";
        timeValue += (Day[day]) + "  ";
        timeValue += ((hours <= 12) ? hours : hours - 12);
        timeValue += ((minutes < 10) ? ":0" : ":") + minutes;
        timeValue += ((seconds < 10) ? ":0" : ":") + seconds;
        timeValue += (hours < 12) ? "  " + "上午" : "  " + "下午";
        timerID = setTimeout("showtime()", 1000);
        var t = $("#timeValue");
        t.html(timeValue);
    }