function Clock() {  
	var date = new Date();  
	this.year = date.getFullYear();  
	this.month = date.getMonth() + 1;  
	this.date = date.getDate();  
	this.day = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六")[date.getDay()];  
	this.hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();  
	this.minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();  
	this.second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();    
	this.toString = function() {  
		return this.year + "年" + this.month + "月" + this.date + "日 "+ " " + this.day+" " + this.hour + ":" + this.minute + ":" + this.second ;  
	};   
	this.display = function(ele) {  
		var clock = new Clock();  
		ele.innerHTML = clock.toString();  
		window.setTimeout(function() {clock.display(ele);}, 1000);  
	};  
}  
var clock = new Clock();  
clock.display(document.getElementById("showtime")); 