js中转换日期格式

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("Thu Aug 22 2013 15:12:00 GMT+0800", 'yyyy-MM-dd HH:mm:ss'))