function date(){   
    //arguments JS自带的变量   
    this.length = arguments.length;   
    for(var  i= 0; i < this.length; i ++){   
        this[i] = date.arguments[i];   
    }   
}   
  
function displaytime(){    
    var d  = new Date();   
    var h = d.getHours();   
    var m = d.getMinutes();   
    var s = d.getSeconds();   
       
    //0-2 午夜 2-5 凌晨 5-9 早上 9-12 上午 12-14 中午 14-18 下午 18-24 晚上      
    var ampm = "上午";   
    if (h >= 0 && h < 2) ampm = "午夜";   
    if (h >= 2 && h < 5) ampm = "凌晨";   
    if (h >= 5 && h < 9) ampm = "早上";   
    if (h >= 9 && h < 12) ampm = "上午";   
    if (h >= 12 && h < 14) ampm = "中午";   
    if (h >= 14 && h < 18) ampm = "下午";   
    if (h >= 18) ampm = "晚上";   
    //12小时制   
    if (h > 24) h -= 24;   
    //补0   
    if (m < 10) m = "0" + m;   
    //补0   
    if (s < 10) s = "0" + s;   
    var time = h + ":" + m + ":" + s;   
    //年月日和星期   
    var day  = new date("星期日","星期一","星期二","星期三","星期四","星期五","星期六");   
    var ymd = d.getYear() + "/" + (d.getMonth() + 1) + "/" + d.getDate();   
    //取得显示位置   
    var timearea = document.getElementById("Clock");   
    timearea.innerHTML = time + "  "  + ymd;   
  
    setTimeout("displaytime()",1000);   
}