js中格式化日期

Date.prototype.format = function(format){ 
var o = { 
"M+" : this.getMonth()+1, //month 
"d+" : this.getDate(), //day 
"h+" : this.getHours(), //hour 
"m+" : this.getMinutes(), //minute 
"s+" : this.getSeconds(), //second 
"q+" : Math.floor((this.getMonth()+3)/3), //quarter 
"S" : this.getMilliseconds() //millisecond 
} 

if(/(y+)/.test(format)) { 
format = format.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 
} 

for(var k in o) { 
if(new RegExp("("+ k +")").test(format)) { 
format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length)); 
} 
} 
return format; 
} 

//使用方法 
var now = new Date(); 
var nowStr = now.format("yyyy-MM-dd hh:mm:ss"); 
//使用方法2: 
var testDate = new Date(); 
var testStr = testDate.format("YYYY年MM月dd日hh小时mm分ss秒"); 
alert(testStr); 
//示例： 
alert(new Date().Format("yyyy年MM月dd日")); 
alert(new Date().Format("MM/dd/yyyy")); 
alert(new Date().Format("yyyyMMdd")); 
alert(new Date().Format("yyyy-MM-dd hh:mm:ss"));

   使用方法:

function getNowFormatDate() 
{ 
var day = new Date(); 
var Year = 0; 
var Month = 0; 
var Day = 0; 
var CurrentDate = ""; 
//初始化时间 
//Year= day.getYear();//有火狐下2008年显示108的bug 
Year= day.getFullYear();//ie火狐下都可以 
Month= day.getMonth()+1; 
Day = day.getDate(); 
//Hour = day.getHours(); 
// Minute = day.getMinutes(); 
// Second = day.getSeconds(); 
CurrentDate += Year + "-"; 
if (Month >= 10 ) 
{ 
CurrentDate += Month + "-"; 
} 
else 
{ 
CurrentDate += "0" + Month + "-"; 
} 
if (Day >= 10 ) 
{ 
CurrentDate += Day ; 
} 
else 
{ 
CurrentDate += "0" + Day ; 
} 
return CurrentDate; 
}