JavaScript Class static Keyword

Definition and Usage

static The keyword is used to define static methods in the class definition.

Static methods are called directly on the class (in the example above, Car）call without creating an instance/object of the class (mycar）。

Instance

Example 1

Create a static method and call it on the class:

class Car {
  constructor(brand) {
    this.carname = brand;
  }
  static hello() {  // static method
    return "Hello!!";
  }
}
mycar = new Car("Ford");
//Call 'hello()' on the class Car:
document.getElementById("demo").innerHTML = Car.hello();
//Do not call on the 'mycar' object:
//document.getElementById("demo").innerHTML = mycar.hello();
//Error will occur

Kişisel Deneyim

Example 2

If you want to use the mycar object inside a static method, you can send it as a parameter:

Send "mycar" as a parameter:
class Car {
  constructor(brand) {
    this.carname = brand;
  }
  static hello(x) {
    return "Hello " + x.carname;
  }
}
mycar = new Car("Ford");
document.getElementById("demo").innerHTML = Car.hello(mycar);

Kişisel Deneyim

Sözdizimi

static methodName()

Teknik Ayrıntılar

JavaScript Sürümü: ECMAScript 2015 (ES6)

Tarayıcı Desteği

Keyword Chrome IE Firefox Safari Opera
static 49.0 13.0 45.0 9.0 36.0

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