JavaScript 日期格式化

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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; 
            }
   
    }
   
//how to use
new Date().format('yyyy-MM-dd hh:mm:ss');