JS中的原型继承以及如何获取父属性

var parent = {
  name: 'parent',
  sayHello: function() {
    console.log('Hello, ' + this.name);
  }
};

var child = Object.create(parent);
child.name = 'child';

child.sayHello(); // 输出 "Hello, child"

function Parent() {
  this.name = 'parent';
  this.sayHello = function() {
    console.log('Hello, ' + this.name);
  };
}

function Child() {
  Parent.call(this);
  this.name = 'child';
}

var child = new Child();
child.sayHello(); // 输出 "Hello, child"

var parent = {
  name: 'parent',
  sayHello: function() {
    console.log('Hello, ' + this.name);
  }
};

var child = Object.create(parent);
child.name = 'child';

var parentProto = Object.getPrototypeOf(child);
console.log(parentProto.name); // 输出 "parent"

var parent = {
  name: 'parent',
  sayHello: function() {
    console.log('Hello, ' + this.name);
  }
};

var child = Object.create(parent);
child.name = 'child';

console.log(child.__proto__.name); // 输出 "parent"