子类的ES6访问功能

Question

Given the codes below, how do I access the bar() from an the Parent class?

class Parent{
    constructor(){

    }

    foo(){
        this.bar() // not defined
    }
}

class Child extends Parent{
    constructor(){
        super();
    }

    bar(){

    }
} 

Answer 1

You do access it exactly as you did, but for it to be actually defined on this you have to create a Child instance not a Parent one:

var c = new Child();
c.bar() // works
c.foo() // calls c.bar() as well