JS实现以日历形式显示当前时间

效果图：

<script language="Javascript"> 
var datelocalweek=new Array("星期日", "星期一", "星期二","星期三","星期四", "星期五","星期六"); 
var datelocalnow=new Date(); 
var datelocalyear=datelocalnow.getFullYear(); 
var datelocalmonth=(datelocalmonth="0"+(datelocalnow.getMonth()+1)).substr(datelocalmonth.length-2,2); 
var datelocalday=(datelocalday="0"+datelocalnow.getDate()).substr(datelocalday.length-2,2); 
var datelocalweekday=datelocalweek[datelocalnow.getDay()]; 
document.write(datelocalyear+"年"+datelocalmonth+"月"+datelocalday+"日"+" "+datelocalweekday); 
</script> 

//创建一个数组,用于存放每个月的天数 
function montharr(m0, m1, m2, m3, m4, m5, m6, m7, m8, m9, m10, m11) { 
this[0] = m0; 
this[1] = m1; 
this[2] = m2; 
this[3] = m3; 
this[4] = m4; 
this[5] = m5; 
this[6] = m6; 
this[7] = m7; 
this[8] = m8; 
this[9] = m9; 
this[10] = m10; 
this[11] = m11; 
} 
//实现月历 
function calendar() { 
var monthNames = "JanFebMarAprMayJunJulAugSepOctNovDec"; 
var today = new Date(); 
var thisDay; 
var monthDays = new montharr(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); 
year = today.getYear() +1900; 
thisDay = today.getDate(); 
if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) 
monthDays[1] = 29; 
nDays = monthDays[today.getMonth()]; 
firstDay = today; 
firstDay.setDate(1); 
testMe = firstDay.getDate(); 
if (testMe == 2) 
firstDay.setDate(0); 
startDay = firstDay.getDay(); 
var dayNames = new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六"); 
var monthNames = new Array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"); 
var now = new Date(); 
document.write("<div id='rili' style='position:absolute;140px;left:200px;top:50px;'>") 
document.write("<TABLE width='217' BORDER='0' CELLSPACING='0' CELLPADDING='2' BGCOLOR='#0080FF'>") 
document.write("<TR>"); 
document.write(" <TD> "); 
document.write(" <table border='0' cellspacing='1' cellpadding='2' bgcolor='Silver'>"); 
document.write(" <TR><th colspan='7' bgcolor='#C8E3FF'>"); 
document.writeln(" <FONT STYLE='font-size:9pt;Color:#330099'>" + "公元 " + now.getYear() + "年" + monthNames[now.getMonth()] + " " + now.getDate() + "日 " + dayNames[now.getDay()] + "</FONT>"); 
document.writeln(" </TH></TR><TR><TH BGCOLOR='#0080FF'><FONT STYLE='font-size:9pt;Color:White'>日</FONT></TH>"); 
document.writeln(" <th bgcolor='#0080FF'><FONT STYLE='font-size:9pt;Color:White'>一</FONT></TH>"); 
document.writeln(" <TH BGCOLOR='#0080FF'><FONT STYLE='font-size:9pt;Color:White'>二</FONT></TH>"); 
document.writeln(" <TH BGCOLOR='#0080FF'><FONT STYLE='font-size:9pt;Color:White'>三</FONT></TH>"); 
document.writeln(" <TH BGCOLOR='#0080FF'><FONT STYLE='font-size:9pt;Color:White'>四</FONT></TH>"); 
document.writeln(" <TH BGCOLOR='#0080FF'><FONT STYLE='font-size:9pt;Color:White'>五</FONT></TH>"); 
document.writeln(" <TH BGCOLOR='#0080FF'><FONT STYLE='font-size:9pt;Color:White'>六</FONT></TH>"); 
document.writeln(" </TR><TR>"); 
column = 0; 
for (i=0; i<startDay; i++) { 
document.writeln("
<TD><FONT STYLE='font-size:9pt'> </FONT></TD>"); 
column++; 
} 

for (i=1; i<=nDays; i++) { 
if (i == thisDay) { 
document.writeln("</TD><TD ALIGN='CENTER' BGCOLOR='#FF8040'><FONT STYLE='font-size:9pt;Color:#ffffff'><B>") 
} 
else { 
document.writeln("</TD><TD BGCOLOR='#FFFFFF' ALIGN='CENTER'><FONT STYLE='font-size:9pt;font-family:Arial;font-weight:bold;Color:#330066'>"); 
} 
document.writeln(i); 
if (i == thisDay) 
document.writeln("</FONT></TD>") 
column++; 
if (column == 7) { 
document.writeln("<TR>"); 
column = 0; 
} 
} 
document.writeln("<TR><TD COLSPAN='7' ALIGN='CENTER' VALIGN='TOP' BGCOLOR='#0080FF'>") 
document.writeln("<FORM NAME='clock' onSubmit='0'><FONT STYLE='font-size:9pt;Color:#ffffff'>") 
document.writeln("现在时间:<INPUT TYPE='Text' NAME='face' ALIGN='TOP'></FONT></FORM></TD></TR></TABLE>") 
document.writeln("</TD></TR></TABLE></div>"); 
} 

var timerID = null; 
var timerRunning = false; 

function stopclock (){ 
if(timerRunning) 
clearTimeout(timerID); 
timerRunning = false; 
} 

//显示当前时间 
function showtime () { 
var now = new Date(); 
var hours = now.getHours(); 
var minutes = now.getMinutes(); 
var seconds = now.getSeconds() 
var timeValue = " " + ((hours >12) ? hours -12 :hours) 
timeValue += ((minutes < 10) ? ":0" : ":") + minutes 
timeValue += ((seconds < 10) ? ":0" : ":") + seconds 
timeValue += (hours >= 12) ? " 下午 " : " 上午 " 
document.clock.face.value = timeValue; 
timerID = setTimeout("showtime()",1000);//设置超时,使时间动态显示 
timerRunning = true; 
} 

function startclock () { 
stopclock(); 
showtime(); 
} 

<html> 
<script language="JavaScript" type="text/javascript" src="time.js"> </script> 
<body bgcolor="#FFFFFF" onLoad="startclock(); timerONE=window.setTimeout" text="#000000"> 
<script language="JavaScript" type="text/javascript"> 
calendar(); 
</script> 
</body> 
</html>