Calling a class prototype method by a setInterval event

Question

I have a simple javascript class.

One method of this class sets up a timer using setInterval function. The method that I want to call every time the event fires is

Answer 1

All the answers above are acceptable. I just wanted to add that the binding of this can also be solved by using an arrow function. For example, these are all equivalent to each other. However, the lexical scope is maintained when using arrow functions:

 // Arrow function - my preferred method
 loadingTimer = setInterval(() => this.showLoading, 100);

 // .bind method
 loadingTimer = setInterval(this.showLoading.bind(this), 100);

 // Other method
 var t = this;
 loadingTimer = setInterval(function(){t.showLoading();}, 100);

Hope this helps :D