Free Javascript Editorqueentree

Posted : admin | On 25-03-2021

Example

Free Javascript Editor Queen Tree Pictures
Online Javascript Editor

It has different values depending on where it is used: In a method, this refers to the owner object. Alone, this refers to the global object. In a function, this refers to the global object. In a function, in strict mode, this is undefined. In an event, this refers to the element that received the event. Methods like call, and apply can refer this to any object. Apr 20, 2018 The JavaScript language itself is built into all the browsers you need for testing the scripts, and there are plenty of free JavaScript downloads of complete scripts and libraries that you can either use as is or examine to see how things work in order to write your own code. The javascript (misspelled as java script) is given under GPL License; i.e. Free use for those who use the codes as it is. Free, if your modification does not remove our copyright information and links. Click Here for detailed license information. You can purchase the script if your requirements does not meet our GPL License terms.

var person = {
firstName: 'John',
lastName : 'Doe',
id : 5566,
fullName : function() {
return this.firstName + ' ' + this.lastName;
}
};

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What is this?

The JavaScript this keyword refers to the object it belongs to.

It has different values depending on where it is used:

In a method, this refers to the owner object.
Alone, this refers to the global object.
In a function, this refers to the global object.
In a function, in strict mode, this is undefined.
In an event, this refers to the element that received the event.
Methods like call(), and apply() can refer this to any object.

this in a Method

In an object method, this refers to the 'owner' of the method.

In the example on the top of this page, this refers to the person object.

The person object is the owner of the fullName method.

fullName : function() {
return this.firstName + ' ' + this.lastName;
}

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this Alone

When used alone, the owner is the Global object, so this refers to the Global object.

In a browser window the Global object is [object Window]:

Example

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Free Javascript Editor Queen Tree Pictures

In strict mode, when used alone, this also refers to the Global object [object Window]:

Example

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this in a Function (Default)

In a JavaScript function, the owner of the function is the default binding for this.

So, in a function, this refers to the Global object [object Window].

Example

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this in a Function (Strict)

JavaScript strict mode does not allow default binding.

So, when used in a function, in strict mode, this is undefined.

Online Javascript Editor

Example

'use strict';
function myFunction() {
return this;
}

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this in Event Handlers

In HTML event handlers, this refers to the HTML element that received the event:

Example

<button>
Click to Remove Me!
</button>

Object Method Binding

In these examples, this is the person object (The person object is the 'owner' of the function):

Example

var person = {
firstName : 'John',
lastName : 'Doe',
id : 5566,
myFunction : function() {
return this;
}
};

Try it Yourself »

Example

var person = {
firstName: 'John',
lastName : 'Doe',
id : 5566,
fullName : function() {
return this.firstName + ' ' + this.lastName;
}
};

Try it Yourself »

In other words: this.firstName means the firstName property of this (person) object.

Explicit Function Binding

The call() and apply() methods are predefined JavaScript methods.

They can both be used to call an object method with another object as argument.

You can read more about call() and apply() later in this tutorial.

In the example below, when calling person1.fullName with person2 as argument, this will refer to person2, even if it is a method of person1:

Example

var person1 = {
fullName: function() {
return this.firstName + ' ' + this.lastName;
}
}
var person2 = {
firstName:'John',
lastName: 'Doe',
}
person1.fullName.call(person2); // Will return 'John Doe'

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Example

What is this?

this in a Method

this Alone

Example

Free Javascript Editor Queen Tree Pictures

Example

this in a Function (Default)

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this in a Function (Strict)

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this in Event Handlers

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Example

Example

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