https://www.w3schools.com/js/js_this.asp
What is this?
The JavaScript this keyword refers to the object it belongs to.
It has different values depending on where it is used:
- In a method,
thisrefers to the owner object. - Alone,
thisrefers to the global object. - In a function,
thisrefers to the global object. - In a function, in strict mode,
thisisundefined. - In an event,
thisrefers to the element that received the event. - Methods like
call(), andapply()can referthisto any object.
this in a Method
In an object method, this refers to the "owner" of the method.
In the example on the top of this page, this refers to the person object.
The person object is the owner of the fullName method.
fullName : function() {
return this.firstName + " " + this.lastName;
}
return this.firstName + " " + this.lastName;
}