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Introduction to objects in javascript (with code)

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2019-03-23 11:33:102091browse

This article brings you an introduction to objects in JavaScript (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Everything in JavaScript is an object, and JavaScript allows custom objects.

The object has properties and methods

Properties

var message = "hello world!";var x=message.length;

The value of x is 12

Method

var message="hello world!";var x=message.toUpperCase();

The value of x is "HELLO WORLD!"

Creating objects

Two methods

Define and create instances of objects

Use functions to define objects and then create new object instances

Create an instance directly

student=new Object();
student.name="Sine";
student.age=20;
student.school="XX University";

Or use the following method

student=new Object();student={
    name:"Sine",
    age:20,
    school:"XX University"};

Use functions to create

function register(name,age,school){
    this.name=name;
    this.age=age;
    this.school=school;
    }
    student = new register("Sine",20,"XX University");

Add methods to the object

In The method of defining objects inside the constructor function

function register(name,age,school){
    this.name=name;
    this.age=age;
    this.school=school;
    function ChangeName(name)
    {
        this.name=name;
    }}
student=new register("Sine",20,"XX University");
student.ChangeName("Cosine");

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