Chapter 4 Client-Side Programming: the JavaScript Language
CSI 3140 WWW Structures, Techniques and Standards
Chapter 4 Client-Side Programming: the JavaScript Language
JavaScript History and Versions
JavaScript was introduced as part of the Netscape 2.0 browser Microsoft soon released its own version called JScript ECMA developed a standard language known as ECMAScript ECMAScript Edition 3 is widely supported and is what we will call "JavaScript"
Guy-Vincent Jourdan :: CSI 3140 :: based on Jeffrey C. Jackson's slides
JavaScript Introduction
Let's write a "Hello World!" JavaScript program Problem: the JavaScript language itself has no input/output statements(!) Solution: Most browsers provide de facto standard I/O methods
alert: pops up alert box containing text prompt: pops up window where user can enter
text
Guy-Vincent Jourdan :: CSI 3140 :: based on Jeffrey C. Jackson's slides
JavaScript Introduction
File JSHelloWorld.js: HTML document executing this code:
script element used to load and execute JavaScript code
Guy-Vincent Jourdan :: CSI 3140 :: based on Jeffrey C. Jackson's slides
JavaScript Introduction
Web page and alert box generated by JSHelloWorld.html document and JSHelloWorld.js code:
Guy-Vincent Jourdan :: CSI 3140 :: based on Jeffrey C. Jackson's slides
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