哪个帮个忙，把PHP函数修改为JS函数，多谢

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

    switch (true)
    {

        case age>=0 && age<3:


            x[1]=new Array(60.9,-54),x[2]=new Array(61.0,-51);

            y=1;
            break;



        case age>=3 && age<10:

            x[1]=new Array(22.7,495),x[2]=new Array(22.5,499);
            y=1;

            break;


        case age>=10 && age<18:

            x[1]=new Array(17.5,651),x[2]=new Array(12.2,746);

            y=1;
            break;

        case age>=10 && age<18:

            x[1]=new Array(17.5,651),x[2]=new Array(12.2,746);
            y=0.95;

            break;

        case age>=18 && age<30:

            x[1]=new Array(15.3,679),x[2]=new Array(14.7,496);
            y=0.95;

            break;

        case age>=30 && age<60:

            x[1]=new Array(11.6,879),x[2]=new Array(8.7,829);
            y=0.95;

            break;

        case 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); 

}