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This article mainly introduces the relevant knowledge of "what are the characteristics of javascript". The editor shows you the operation process through an actual case, and the operation method is simple, fast and practical. I hope this article "what are the characteristics of javascript" can help you solve the problem.

Javascript is a client scripting language. JavaScript is an object-based and event-driven client-side scripting language with relative security, and it is also a scripting language widely used in client-side Web development. It is often used to add dynamic functions to HTML (a subset of the standard general markup language) web pages.

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

JavaScript is a case-sensitive client scripting language based on object dynamic types, which is developed from Netscape's LiveScript. The main purpose is to solve the speed problem left by server-side languages, such as Perl, and to provide customers with smoother browsing effect. At that time, the server needs to verify the data, because the speed of the network is very slow, only 28.8kbps, the verification step wastes too much time. So NavigaTor, the browser of Netscape, adds Javascript, which provides the basic function of data verification. The function of js is mainly to realize some special effects of web pages. Special effects that CSS is difficult to achieve are usually used in conjunction with jQuery,Ajax.

JavaScript is an object-based and event-driven client scripting language with relative security. At the same time, it is also a scripting language widely used in client-side Web development, which is often used to add dynamic functions to HTML (a subset of the standard general markup language) web pages, such as responding to various actions of users. Originally designed by Brendan Eich of Netscape, it is a dynamic, weakly typed, prototype-based language with built-in support for classes. JavaScript is a registered trademark of Sun Corporation (which has been acquired by Oracle). Ecma International has formulated the ECMAScript standard based on JavaScript. JavaScript can also be used in other situations, such as server-side programming. The complete JavaScript implementation consists of three parts: ECMAScript, document object model, and browser object model.

JavaScript has the following characteristics:

1) interpretive scripting language

JavaScript is an interpretive scripting language. Unlike C, C++ and other languages that need to be compiled and then run, code written with JavaScript does not need to be compiled and can be run directly.

2) object-oriented

JavaScript is an object-oriented language, using JavaScript can not only create objects, but also manipulate and use existing objects.

3) weak type

JavaScript is a weakly typed programming language with no strict requirements on the data types used. For example, you can initialize a variable to any type, or you can change the type of the variable at any time.

4) dynamic

JavaScript is an event-driven scripting language, which can respond to user input without the help of a Web server. For example, when we visit a web page, when we click on the web page or scroll through the window through the mouse, we can respond to these events directly through JavaScript.

5) Cross-platform

JavaScript is independent of the operating system and can be run in a browser. So a JavaScript script can be run on any system after it has been written, as long as the browser on the system supports JavaScript.

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