对象 原型 原型链 继承

创建自定义对象

// 创建一个Object的新实例,然后在实例上面添加属性和方法

const person = new Object();
person.name = "tiga";
person.age = 18;
person.running = function () {
  console.log("柒");
};

工厂函数

function createObject(name, age, info) {
  const obj = new Object();
  obj.name = name;
  obj.age = age;

  obj.running = function () {
    console.log(info);
  };

  return obj;
}

const person = createObject("tiga", 18, "啊柒");
const student = createObject("zeta", 16, "Carmel");

person.running(); // 啊柒
student.running(); // Carmel

构造函数模式

function Person(name, age, info) { this.name = name; this.age = age; this.running = function () { console.log(info); }; } const person = new Person("啊柒", 18, "啊柒");
const student = new Person("zeta", 16, "Carmel"); 
person.running(); // 啊柒
student.running(); // Carmel

原型模式

    this.name = name; 
    this.age = age; 
 } 
 // 在这里,把方法running定义在了Person的prototype属性上 // person和student共享同一个原型方法running,指向的是同一快内存空间 Person.prototype.running = function (info) { 
 console.log(info);
 };
 const person = new Person("moment", 18); 
const student = new Person("supper", 16); // 在构造函数中这里输出的是false
console.log(person.running === student.running); //true person.running("柒"); // 柒
 student.running("Carmel"); //Carmel