javascript的format格式化时间函数，类似于java的SimpleDataFormat

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;  
   }

 
调用方法：

var time1 = new Date().format("yyyy-MM-dd HH:mm:ss");
var time2 = new Date().format("yyyy-MM-dd");