为什么我不能从Object实例访问Object方法？

Question

There are many methods for Object constructor, like Object.assign() and Object.create(), but why I can't access these methods from Object instances?

var test  = new Object();
//this will return error
test.create();

Answer 1

That is because create , assign and many others are static methods. Static methods belongs to the class so you cannot call them from an instance of that class. Here you can find more info about static methods in js

class Tripple {
  static tripple(n) {
    n = n | 1;
    return n * 3;
  }
}

class BiggerTripple extends Tripple {
  static tripple(n) {
    return super.tripple(n) * super.tripple(n);
  }
}

console.log(Tripple.tripple());
console.log(Tripple.tripple(6));
console.log(BiggerTripple.tripple(3));
var tp = new Tripple();
console.log(tp.tripple()); //Logs 'tp.tripple is not a function'

Answer 2

You already created a object with new variable. You can try this to create new object using create keyword

var testObj = Object.create(null);

typeof(testObj) // Object
console.log(testObj) // Object with prototype object as null

// Set property to object
testObj.name = "Stackoverflow";

console.log(testObj)