/**
 * 格式化时间和时间戳
 *
 * @param 
 * @arrange (512.笔记) jb51.cc
 **/
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;
}

var now = new Date().format("yyyy-MM-dd hh:mm:ss"); 
new Date().format("yy-MM-dd hh:mm");