用于getter和setter的对象定义属性

Question

I'm getting an error on Maximum call stack size for this code.

function ValueObject() {
}

ValueObject.prototype.authentication;

Object.defineProperty(ValueObject.prototype, "authentication", {
    get : function () {
        return this.authentication;
    },
    set : function (val) {
        this.authentication = val;
    }
});

var vo = new ValueObject({last: "ac"});
vo.authentication = {a: "b"};
console.log(vo);

Error

RangeError: Maximum call stack size exceeded

Answer 1

That's because the set function is executed each time the assignment happens. You are defining a recursive code. If you define a different property other than authentication then you don't get that error.

Object.defineProperty(ValueObject.prototype, "authentication", {
    get : function () {
        return this._authentication;
    },
    set : function (val) {
        this._authentication = val;
    }
});