Class and__ proto__ Property, the class prototype chain has two inheritance routes

Two day inheritance route of class ： Class as an object __proto__ attribute ;Class Syntax sugar as a constructor , At the same time there is prototype Properties and __proto__ attribute ;

（1） A subclass __proto__ attribute , Represents the inheritance of the constructor , Always point to the parent class .
（2） Subclass prototype Attribute __proto__ attribute , Represents the inheritance of methods , Always point to the parent prototype attribute .

class Person {
    
  constructor(name, sex) {
    
    this.name = name;
    this.sex = sex;
  }
  say() {
    
    return ('lalalala' + this.name)
  }
}
Person.color = 'red'

class PersonOther extends Person {
    
  constructor(x,y) {
    
    super(x,y)
  }
}

console.log(PersonOther.__proto__ === Person)  // true //  Prototype chain formation 
console.log(PersonOther.prototype.__proto__ === Person.prototype) // true //  Prototype chain formation 

console.log(PersonOther.color) // red  Class integration static attributes are not used by instances , Only static attributes between classes implement inheritance 

let kate = new PersonOther('kate', 'woman')
console.log(kate.name, kate.sex)  // kate woman

console.log(kate.color)   // undefined
console.log(kate.say())   // lalalala kate