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Jsp is a dynamic web page technical standard, which can embed Java code and specific changes into static pages to dynamically generate part of the content with static pages as templates, while javascript is a lightweight, interpretive or real-time compiled programming language with function priority.

This article operating environment: windows7 system, javascript1.8.5 version, DELL G3 computer

One: jsp concept

JSP (full name JavaServer Pages) is a dynamic web technology standard led by Sun Microsystems. JSP is deployed on the network server, it can respond to the request sent by the client, and dynamically generate Web web pages of HTML, XML or other format documents according to the content of the request, and then return to the requester. JSP technology uses Java as the scripting language to provide services for users' HTTP requests, and can work with other Java programs on the server to deal with complex business requirements.

JSP embeds Java code and specific changes into static pages, and uses static pages as templates to dynamically generate some of the contents. JSP introduces a XML tag called "JSP Action" to invoke built-in functionality. Alternatively, you can create JSP tag libraries and then use them like standard HTML or XML tags. Tag libraries enhance functionality and server performance and are not limited by cross-platform issues. The JSP file is converted into more primitive Servlet code by its compiler at run time. The JSP compiler can compile JSP files into Servlet written in Java code, and then be compiled into binary machine code that can be executed quickly by the Java compiler, or directly into binary code.

Second: javascript concept

JavaScript (JS for short) is a lightweight, interpretive or just-in-time programming language with function priority. Although it is known as a scripting language for developing Web pages, it is also used in many non-browser environments. JavaScript is based on prototype programming, multi-paradigm dynamic scripting language, and supports object-oriented, imperative, declarative, and functional programming paradigms.

JavaScript was first designed and implemented in Netscape Navigator browser by Brendan Eich of Netscape in 1995. Because Netscape works with Sun, Netscape management wants it to look like Java, so it is named JavaScript. But in fact, its grammar style is similar to that of Self and Scheme.

The standard of JavaScript is ECMAScript. As of 2012, all browsers fully support ECMAScript 5.1, and older browsers support at least the ECMAScript 3 standard. On June 17, 2015, ECMA International released the sixth edition of ECMAScript, which is officially called ECMAScript 2015, but is often referred to as ECMAScript 6 or ES2015.

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