如何使用js显示当前时间

如何使用js显示当前时间。

<span id="clock" style="font-size:14px;"></span>

js脚本

$(document).ready(function () {
//第一种
showTime();
//第二种
var clock = new Clock();
clock.display($("#clock"));
});
//显示系统当前时间处理 第一种方法 
function showTime() {
 var myArray = new Array(7);
 var TD = new Date();
 myArray[0] = "星期日";
 myArray[1] = "星期一";
 myArray[2] = "星期二";
 myArray[3] = "星期三";
 myArray[4] = "星期四";
 myArray[5] = "星期五";
 myArray[6] = "星期六";
 weekday = TD.getDay();
 var h = TD.getHours();
 var m = TD.getMinutes();
 var s = TD.getSeconds();
 var hstr = h;
 var mstr = m;
 var istr = s;
 if (h < 10) { hstr = "0" + h };
 if (m < 10) { mstr = "0" + m };
 if (s < 10) { istr = "0" + s };
 $("#clock").innerHTML('当前时间：'
 + new Date().toLocaleDateString() + " " + myArray[weekday] + " " + hstr
 + ":" + mstr + ":" + istr);
 setTimeout(showTime, 1000);
}
//显示系统当前时间处理 第二种方法
function Clock() {
var date = new Date();
this.year=date.getFullYear();
this.month=date.getMonth()+1;
this.date=date.getDate();
this.day=newArray("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"现在时间是:"+this.year+"年"+this.month+"月"+this.date+"日"+this.hour+":"+this.minute+":"+this.second+""+this.day;
};
this.toSimpleDate=function(){
returnthis.year+"-"+this.month+"-"+this.date;
};
this.toDetailDate=function(){
returnthis.year+"-"+this.month+"-"+this.date+""+this.hour+":"+this.minute+":"+this.second;
};
this.display=function(ele){
varclock=newClock();
ele.innerHTML=clock.toString();
window.setTimeout(function(){clock.display(ele);},1000);
};
}