js转化毫秒为时间格式代码

<scripttype="text/javascript">
varformat=function(time,format){
vart=newDate(time);
vartf=function(i){return(i<10?"0":"")+i};
returnformat.replace(/yyyy|MM|dd|HH|mm|ss/g,function(a){
switch(a){
case"yyyy":
returntf(t.getFullYear());
break;
case"MM":
returntf(t.getMonth()+1);
break;
case"mm":
returntf(t.getMinutes());
break;
case"dd":
returntf(t.getDate());
break;
case"HH":
returntf(t.getHours());
break;
case"ss":
returntf(t.getSeconds());
break;
};
});
};
alert(format(1396178344662,"yyyy-MM-ddHH:mm:ss"));
</script>