js转化毫秒为时间格式代码

代码：

<script type="text/javascript"> 
var format = function(time, format){ 
var t = new Date(time); 
var tf = function(i){return (i < 10 ? '0' : '') + i}; 
return format.replace(/yyyy|MM|dd|HH|mm|ss/g, function(a){ 
switch(a){ 
case 'yyyy': 
return tf(t.getFullYear()); 
break; 
case 'MM': 
return tf(t.getMonth() + 1); 
break; 
case 'mm': 
return tf(t.getMinutes()); 
break; 
case 'dd': 
return tf(t.getDate()); 
break; 
case 'HH': 
return tf(t.getHours()); 
break; 
case 'ss': 
return tf(t.getSeconds()); 
break; 
}; 
}); 
}; 
alert(format(1396178344662, 'yyyy-MM-dd HH:mm:ss')); 
</script>