js日期转换

Date.prototype.format = function(f){    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(f))f=f.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));    for(var k in o)        if(new RegExp("("+ k +")").test(f))f = f.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length));return f};

  formatter : function(value, rowData, rowIndex) {var d= new Date(); d.setTime(value);    var s=d.format('yyyy-MM-dd');  return s;  }