后台管理导航栏时间提醒代码。

<html>
	<head>
		<title>ceshi</title>
		
	</head>
<body><div id="header">

    <script type="text/javascript">
        now = new Date(), 
        hour = now.getHours() 
        if(hour < 6){document.write("尊敬的用户：您来的可真早！")} 
        else if (hour < 8){document.write("尊敬的用户：新的一天开始啦！")} 
        else if (hour < 12){document.write("尊敬的用户：上午好！")}
        else if (hour < 14){document.write("尊敬的用户：中午好！")}
        else if (hour < 18){document.write("尊敬的用户：下午好！")} 
        else if (hour < 22){document.write("尊敬的用户：晚上好！")} 
        else if (hour < 24){document.write("尊敬的用户：夜深了，早点休息吧！")}
    </script>

    【今天是

    <script type="text/javascript">
        today=new Date();
        function initArray(){
        this.length=initArray.arguments.length
        for(var i=0;i<this.length;i++)
        this[i+1]=initArray.arguments[i]  }
        var d=new initArray(
        "星期日",
        "星期一",
        "星期二",
        "星期三",
        "星期四",
        "星期五",
        "星期六");
        document.write(
        "<font style='font-size:9pt;font-family: 宋体'> ",
        today.getFullYear(),"-",
        today.getMonth()+1,"-",
        today.getDate(),"",
        "    ",
        d[today.getDay()+1],
        "</font>" ); 
    </script>

    】
</div></body>
</html>
　参考资料：http://www.cnblogs.com/52net/archive/2013/04/26/3044664.html