Getter/setter in constructor

You can’t do that.

You can set setter/getters for properties of objects though. I advice you use ES5 Object.defineProperties though. of course this only works in modern browsers.

var obj = function() {
    ...
    Object.defineProperties(this, {
        "test": {
             "get": function() { ... },
             "set": function() { ... }
        }
    });
}

obj.prototype.func = function() { ... }

var o = new obj;
o.test;
o.func();