JavaScript is a literal scripting language, a dynamically typed, weakly typed, prototype-based language. 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.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
JavaScript ("JS" for short) is a lightweight, interpreted or just-in-time compiled programming language with function priority. Although it is famous as a scripting language for developing Web pages, it is also used in many non-browser environments. JavaScript is a dynamic scripting language based on prototype programming, multi-paradigm, and supports object-oriented, imperative and declarative (such as functional programming) style.
JavaScript script language has the following characteristics:
(1) Script language. JavaScript is an interpreted scripting language. Languages such as C and C are compiled first and then executed, while JavaScript is interpreted line by line during the running of the program.
(2) Based on objects. JavaScript is an object-based scripting language that can not only create objects but also use existing objects.
(3)Simple. The JavaScript language uses weakly typed variable types and does not impose strict requirements on the data types used. It is a scripting language based on Java's basic statements and controls, and its design is simple and compact.
(4)Dynamic. JavaScript is an event-driven scripting language that can respond to user input without going through a Web server. When visiting a web page, JavaScript can directly respond to these events when the mouse is clicked, moved up or down, or moved in the window.
(5) Cross-platform. JavaScript scripting language does not depend on the operating system and only requires browser support. Therefore, after writing a JavaScript script, it can be brought to any machine for use, provided that the browser on the machine supports the JavaScript scripting language. Currently, JavaScript is supported by most browsers.
[Recommended learning: javascript advanced tutorial]
JavaScript is a high-level scripting language belonging to the Internet. It has been widely used in Web application development and is often used for web pages. Add a variety of dynamic functions to provide users with a smoother and more beautiful browsing effect. Usually JavaScript scripts realize their functions by embedding them in HTML.
Main functions
1. Embed dynamic text in HTML pages.
2. Respond to browser events.
3. Read and write HTML elements.
4. Validate data before it is submitted to the server.
5. Detect the visitor’s browser information. Control cookies, including creation and modification.
6. Server-side programming based on Node.js technology.
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