SOURCE

function Parent() {
  this.color = ['red','green'];
}

Parent.prototype.sayHello = function() {
  console.log('Hello from parent'); 
}

function Child() {
}

Child.prototype = new Parent(); //继承了parent

let child = new Child();
child.sayHello(); // Hello from parent

child.color.push('black','pink');
console.log('child:'+child.color);//"child:red,green,black,pink"

let child2 = new Child();
console.log('child2:'+child2.color);// "child2:red,green,black,pink"