哪个帮个忙，把PHP函数修改为JS函数，多谢

哪个帮个忙，把PHP函数修改为JS函数，谢谢！
function bmrs($weight=0,$sex=1,$age){


switch ($age) {

case $age>=0 and $age

$x=array(1=>array(60.9,-54),2=>array(61.0,-51));

$y=1;


break;



case $age>=3 and $age
$x=array(1=>array(22.7,495),2=>array(22.5,499));
$y=1;

break;


case $age>=10 and $age
$x=array(1=>array(17.5,651),2=>array(12.2,746));

$y=1;
break;

case $age>=10 and $age
$x=array(1=>array(17.5,651),2=>array(12.2,746));
$y=0.95;

break;

case $age>=18 and $age
$x=array(1=>array(15.3,679),2=>array(14.7,496));
$y=0.95;

break;

case $age>=30 and $age
$x=array(1=>array(11.6,879),2=>array(8.7,829));
$y=0.95;

break;

case $age>=60:

$x=array(1=>array(13.5,487),2=>array(10.5,596));
$y=0.95;

break;

default:
break;
}


return ceil(($x[$sex][0]*$weight+$x[$sex][1])*$y); //对浮点数进行四舍五入

}

自带参数这几个，前面二个是默认值吗？$weight=0,$sex=1,$age

这二个代码，修改为JS，遇到了难度：

case $age>=0 and $age$x=array(1=>array(60.9,-54),2=>array(61.0,-51));


哪位帮个忙，把它修改为JavaScript的，谢谢。



------解决方案--------------------

JScript code

function bmrs(weight,sex,age){
    var x=new Array(2),y=null;

    switch (true)
    {

        case age>=0 && age=3 && age=10 && age=10 && age=18 && age=30 && age=60:

            x[1]=new Array(13.5,487),x[2]=new Array(10.5,596);
            y=0.95;

            break;

        default:
           break;
    }

    return Math.ceil((x[1][0]*weight+x[1][1])*y); 

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