JavaScript Object-oriented (i)

JavaScript Object-oriented

An object is a reference type, and the value of an object is an instance of a reference type. A reference type is a data structure in JavaScript that organizes data and functionality together. It is often called a class, but there is no class concept in JavaScript. Although JavaScript is an object-oriented language, it does not have the basic structure of classes and interfaces supported by traditional object-oriented languages.

object creation and common operations

• Using the new operator　　　　

var New Object ();        // use the new operator to create an object user.name = ' mouse ';        // Adding an attribute to an object user.age = 22

• Object literal (JSON mode)

var user = {    name:' Zhang San ', age    :+,    address:' Chengdu '    };  

• Simple Way (Traditional assignment method)

var user == ' John Doe ';        // adding properties to an object user.age =' Chengdu, Sichuan ';

• The invocation of the property

There are two ways to call object properties:

Alert (User.Name + "" +user.age); // back to ' programming prodigal Sichuan Chengdu '

Another way:

Alert (user[' name '] + "" +user[' age '); // back to ' programming prodigal Sichuan Chengdu '

• Add Method

  varuser ={name:' Programming Prodigal ',//adding properties to an objectage:22, Address: ' Chengdu, Sichuan ', Showinfo:function(){                             //Add a methodAlert This. name+ "" + This. age+ "" + This. Address); }, Showhello:showhello//add a method outside an object to an object}; functionShowhello () {alert ("Hello!"); } user.showinfo ();//Call Method User.showhello (); 

JavaScript Object-oriented (i)