如何使用参数作为对象属性？

In PHP we do it like this:

function($param)
{
     $this->{$param};
}

How can we do it in JavaScript?

I don't know PHP but you could use square bracket notation to access properties.

function(param)
{
     this[param];
}

in javascript you can write like this

function House(rooms,price,garage) {
    this.rooms=rooms;
    this.price=price;
    this.garage=garage;
}