功能代码集合

JS原型链

function Person() {}
Person.prototype.name = "abc";
Person.prototype.sayName = function () {
  console.log(this.name);
};

let person = new Person();

person.__proto__ = Person.prototype;
String.__proto__ = Function.prototype;
String.constructor = Function;

JS继承

原型继承

function Parent() {
  this.name = "Parent";
  this.sex = "male";
}

function Child() {
  this.name = "Child";
}

Child.prototype = new Parent();

构造函数继承

function Parent(name) {
  this.name = name;
}

function Child() {
  Parent.call(this, "Child");
}

组合继承

function Person(name) {
  this.name = name;
}

function Child(name) {
  Person.call(this, name);
}

Child.prototype = new Persion();
Child.prototype.constructor = Child;

new关键字

function _new(constructor, ...arg) {
  let obj = {};
  obj.__proto__ = constructor.prototype;
  let res = constructor.apply(obj, arg);
  return Object.prototype.toString.call(res) === "[object Object]" ? res : obj;
}

Tags: 前端

赏

使用微信打赏

使用支付宝打赏

雅致寓于高阁渔舟唱晚，古典悠然；
格调外发园林绿树萦绕，馥郁清香。

扫描二维码，分享此文章