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
"Z" : this.toString().replace(/.*GMT([+\-\d]{5}).*/, "$1")
};
var week = {
"0" : "\u65e5",
"1" : "\u4e00",
"2" : "\u4e8c",
"3" : "\u4e09",
"4" : "\u56db",
"5" : "\u4e94",
"6" : "\u516d"
};
if(/(y+)/.test(format)) format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4- RegExp.$1.length));
if(/(E+)/.test(format)) format=format.replace(RegExp.$1, ((RegExp.$1.length>1) ? (RegExp.$1.length>2 ? "\u661f\u671f" : "\u5468") : "")+week[this.getDay()+""]);
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;
};
e.g.
console.log(new Date().format("yyyy-MM-dd EEEE HH:mm"));