


Detailed explanation of javascript prototype pattern usage examples_javascript skills
The examples in this article describe the usage of JavaScript prototype mode. Share it with everyone for your reference. The specific analysis is as follows:
Generally after understanding the disadvantages of factory pattern and constructor pattern, you will know why prototype pattern is needed
Definition of prototype pattern i: Every function has a prototype attribute, which is an object whose purpose is to contain properties and methods that can be shared by all instances of a specific type. For example, in the sayInformation() method in the constructor model, if two instances are declared, the sayInformation method must be constructed twice, but it is not necessary to declare it twice. This is why the prototype pattern appears (Nima, those blogs on the Internet all have Is it nonsense, or is it easy to understand when reading a book), after sayInformation() is declared as prototype mode, the instance is shared, and there is no need to declare it twice
function Person(){} Person.prototype.name="jack"; Person.prototype.age=10; Person.prototype.sayInformation=function() { console.log("my name is"+this.name+" age is"+this.age); } var person1 = new Person(); person1.sayInformation(); console.info(person1.name); //来自原型的属性name person1.name="Greg"; //修改实例的name属性 console.info(person1.name); //来自实例的属性name delete person1.name ; //来自实例的属性,这里删除的是实例的属性,但是原型的属性依然存在 console.info(person1.name); //来自原型的属性name var person2 = new Person(); person2.sayInformation(); console.info(person1.hasOwnProperty("name")); //hasOwnProperty检查属性是属于实例还是原型中,如果是实例中就返回true console.info(person1.name==person2.name); console.info(person1.sayInformation==person2.sayInformation); console.info(person1.constructor); //指向person1的构造函数 //原型更加简便的写法 function Person2(){} Person2.prototype={ name:"jack", age:29, sayInformationfunction:function() { console.log("my name is"+this.name+" age is"+this.age); } }
I hope this article will be helpful to everyone’s JavaScript programming design.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

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.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.


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