日期格式化

//日期格式化
Date.prototype.format = function (format) {
/* 
* eg:format="yyyy-MM-dd hh:mm:ss"; 
*/
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;
};