Web Front-end
JS Tutorial
Detailed explanation of js class inheritance and prototype inheritance_javascript skills
Detailed explanation of js class inheritance and prototype inheritance_javascript skills
The example in this article shares with you the code related to js class inheritance and prototype inheritance for your reference. The specific content is as follows
1.js class inheritance
/* -- 类式继承 -- */
//先声明一个超类
function Person(name) {
this.name = name;
}
//给这个超类的原型对象上添加方法 getName
Person.prototype.getName = function() {
return this.name;
}
//实例化这个超
var a = new Person('Darren1')
console.log(a.getName());//Darren1
//再声明类
function Programmer(name, sex) {
//这个类中要调用超类Person的构造函数，并将参数name传给它
Person.call(this, name);
this.sex = sex;
}
//这个子类的原型对象等于超类的实例
Programmer.prototype = new Person();
//因为子类的原型对象等于超类的实例，所以prototype.constructor这个方法也等于超类构造函数，你可以自己测试一下，如果没这一步，console.log(Programmer.prototype.constructor这个是Person超类的引用，所以要从新赋值为自己本身
console.log(Programmer.prototype.constructor);
/*function Person(name) {
this.name = name;
} */
Programmer.prototype.constructor = Programmer;
console.log(Programmer.prototype.constructor);
/*function Programmer(name, sex) {
Person.call(this, name);
this.sex = sex;
}
*/
//子类本身添加了getSex 方法
Programmer.prototype.getSex = function() {
return this.sex;
}
//实例化这个子类
var _m = new Programmer('Darren2', 'male');
//自身的方法
console.log(_m.getSex());//male
//继承超类的方法
console.log(_m.getName());//Darren2
2.js prototypal inheritance
/* -- 原型式继承 -- */
//clone()函数用来创建新的类Person对象
var clone = function(obj) {
4
var _f = function() {};
//这句是原型式继承最核心的地方，函数的原型对象为对象字面量
_f.prototype = obj;
return new _f;
}
//先声明一个对象字面量
var Person = {
name: 'Darren',
getName: function() {
return this.name;
}
}
//不需要定义一个Person的子类，只要执行一次克隆即可
var Programmer = clone(Person);
//可以直接获得Person提供的默认值，也可以添加或者修改属性和方法
alert(Programmer.getName())
Programmer.name = 'Darren2'
alert(Programmer.getName())
//声明子类,执行一次克隆即可
var Someone = clone(Programmer);
The above is the entire content of this article. I hope it will be helpful to everyone in learning javascript programming.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1662
14
1419
52
1313
25
1262
29
1235
24
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
The Evolution of JavaScript: Current Trends and Future Prospects
Apr 10, 2025 am 09:33 AM
The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.
JavaScript Engines: Comparing Implementations
Apr 13, 2025 am 12:05 AM
Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.
JavaScript: Exploring the Versatility of a Web Language
Apr 11, 2025 am 12:01 AM
JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.
Python vs. JavaScript: The Learning Curve and Ease of Use
Apr 16, 2025 am 12:12 AM
Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.
How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)
Apr 11, 2025 am 08:22 AM
This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base
From C/C to JavaScript: How It All Works
Apr 14, 2025 am 12:05 AM
The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.
Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)
Apr 11, 2025 am 08:23 AM
I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing
