JS实现数字时钟

window.οnlοad=function () {
	showTime();
	setInterval(function(){
			showTime();
	},1000);
 
}
function showTime()
{
	var time=new Date;
	var y=time.getFullYear();
	var M=time.getMonth()+1;
	var d=time.getDate();
	var h=time.getHours();
	var m=time.getMinutes();
	var s=time.getSeconds();
	
    M = change(M);
    d = change();
    
    h = change(h);
    m = change(m);
    s = change(s);
    
	alert(y+"年"+M+"月"+d+"日"+h+" :"+m+" :"+s);//得到年月日 时分秒
	
}
function change(t){
    if(t<10){
        t = "0"+t;
    }
    retrun t;
}