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This article mainly explains "what are the elements of objects in javascript". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what are the elements of objects in javascript.

There are two elements of an object in javascript, namely: 1, attribute, which is a group of data used to describe the characteristics of the object, that is, several variables; 2, method, which is used to manipulate several actions of the object's characteristics, that is, several functions.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Three kinds of objects are supported in JavaScript: built-in objects (native objects), browser objects, and custom objects. The following article will introduce you. I hope it will be helpful to you.

An object contains two elements:

1. A set of data used to describe the properties of an object, that is, several variables, usually called attributes.

2. Several actions used to manipulate the properties of an object, that is, a number of functions, are often called methods.

Object types of javascript

1. Built-in objects (native objects):

It refers to the predefined objects in the JavaScript language, which are defined in the ECMAScript standard and are implemented by all browser manufacturers. Because of the unity of the standard, the browser compatibility of these objects is not too big.

String 、 Number 、 Boolean Array 、 Date 、 RegExp 、 Math Error Object 、 Function Global

2. Browser (window) object:

The Window object represents a browser window or a frame. In the client-side JavaScript, the Window object is a global object and all expressions are evaluated in the current environment.

1), the window object is the top object

2). The window object has six attributes, including document, frames, history, location, navigator and screen, which are also objects themselves.

3) the document attribute under the window object is also an object, and five attributes (anchors, forms, images, links, location) under the document are also objects.

Description:

All browsers support window objects. It represents the window of the browser. All global JavaScript objects, functions, and variables automatically become members of the window object.

Global variables are properties of the window object.

The global function is the method of the window object.

Even the (HTML DOM's) document object is a window object property: window.document.getElementById ("header")

Equivalent to: document.getElementById ("header")

3. Custom objects:

Refers to an object created by a user, and compatibility issues need to be noticed by the writer

Create 3 kinds of custom objects:

1) object direct quantity; A mapping table consisting of name / value pairs separated by colons and name / value pairs separated by commas var obj1 = {}

Var obj2 = {x name:'Mary',age:18 0 jade 0}; var obj3 = {name:'Mary',age:18}

2), new Object (); create system object, create general object, create custom object (custom constructor) var obj1 = new Array

Var obj2 = new Date ()

3), function object template

Thank you for your reading, these are the contents of "what are the elements of objects in javascript". After the study of this article, I believe you have a deeper understanding of what the elements of objects in javascript have, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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