How to use static methods in javascript

How to use static methods in JavaScript: Defining a function actually defines a class [class], the code is [Person.say=function(){console.log('I am a Person,I can say.')}].

The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

How to use static methods in javascript:

static method

Person.say=function(){
    console.log('I am a Person,I can say.')
};
Person.say(); //正常运行
var carl=new Person;
carl.say(); //报错

We added a say method to the Person class, which is on the class , so, it is actually a static method.

Static method: Static methods cannot be called on instances of a class, but should be called through the class itself.

Class (class) defines static methods through the static keyword. The above definition of the Person.say method is equivalent to:

class Person {
  static say() {
    return console.log('I am a Person, I can say.');
  }
}

Instance method

Person.prototype.getName=function(name){
    console.log('My name is '+name);
}
Person.getName('Carl'); //报错
var carl=new Person;
carl.getName('Carl'); //正常运行

getName This method is actually on the prototype. Only when an instance is created, can the instance be passed for a visit.

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