How to pass “this” to window setInterval

Question

Suppose I have a function a:

function a() {
    this.b = 1;
    this.set = setInterval(function() {console.log(this.b);}, 200);
}

So when

Answer 1

Just save your this reference in some other variable, that is not overridden by the window-call later on. Later you can use that variable to reference he object you started with.

function a() {
    this.b = 1;
    var that = this;
    this.set = setInterval(function() {console.log(that.b);}, 200);
}