What does js mean?

js means JavaScript. It is a dynamically typed, weakly typed, prototype-based language with built-in support for types. Its interpreter is called the JavaScript engine, which is part of the browser and is widely used in client-side scripting languages to add dynamic features to HTML web pages.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript is a literal scripting language. It is a dynamically typed, weakly typed, prototype-based language with built-in support for types. Its interpreter is called the JavaScript engine, which is part of the browser and is widely used in client-side scripting languages. It was first used on HTML (an application under Standard Universal Markup Language) web pages to add dynamic functions to HTML web pages. .

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript is a network scripting language that has been widely used in Web application development. It is often used to add various dynamic functions to web pages to provide users with smoother and more beautiful browsing effects. Usually JavaScript scripts realize their functions by embedding them in HTML.

Features

1. It is an interpretive scripting language (the code is not pre-compiled).

2. Mainly used to add interactive behaviors to HTML (an application under Standard Universal Markup Language) pages.

3. It can be directly embedded into HTML pages, but writing it as a separate js file is beneficial to the separation of structure and behavior.

4. Cross-platform features. With the support of most browsers, it can run on multiple platforms (such as Windows, Linux, Mac, Android, iOS, etc.).

Javascript scripting language, like other languages, has its own basic data types, expressions and arithmetic operators, and the basic program framework of the program. Javascript provides four basic data types and two special data types for processing data and text. Variables provide a place to store information, and expressions can complete more complex information processing.

What can js do?

1. Make web pages interactive, such as responding to user clicks and providing users with a better experience.

2. Can process forms, verify user input, and provide timely feedback to save users time. . For example, if the form asks you to enter your email address but you enter a mobile phone number, you should be given a reminder.

3. You can also dynamically create pages based on user operations. For example, when sending an email, add an attachment.

4. Set a cookie. A cookie is some temporary information stored on the browser, such as the website address you have visited and the user name you have used

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