JS日期格式化函数

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;
}