setInterval，对象方法只运行一次

Question

The following structure

function SomeObject() {}

SomeObject.prototype.repeatWhat = function() {
    setInterval(this.what, 1);
}

SomeObject.prototype.what = function() {
    console.log("what?");
}

Produces only a single "what?" in the console, why isn't it just running perpetually?

I call it like so

var someInstance = new SomeObject();
someInstance.what();

Answer 1

You aren't calling repeatWhat in your code

var someInstance = new SomeObject();
someInstance.what();
someInstance.repeatWhat(); //I've added this