文档介绍：WEB DESIGN AND PROGRAMMING
Introduction
to Javascript
WEB DESIGN AND PROGRAMMING
Outline
Introduction
Simple Program: Printing a Line of Text in a Web Page
Data types
Obtaining User Input with prompt Dialogs
Memory Concepts
Arithmetic
Decision Making: Equality and Relational Operators
Web Resources
WEB DESIGN AND PROGRAMMING
Objectives
In this lesson, you will learn:
To be able to write simple JavaScript programs.
To be able to use input and output statements.
To understand basic memory concepts.
To be able to use arithmetic operators.
To understand the precedence of arithmetic operators.
To be able to write decision-making statements.
To be able to use relational and equality operators.
WEB DESIGN AND PROGRAMMING
1  Introduction
JavaScript scripting language
Enhances functionality and appearance
Client-side scripting
Makes pages more dynamic and interactive
Foundation plex server-side scripting
Allows us to develop webpages that act as programs
Gives us more control than normal HTML/CSS
WEB DESIGN AND PROGRAMMING
1  Introduction
JavaScript is the backbone of Web
Web is more than just visual style
The second generation of munities and information sharing
User centred design to facilitate creativity
A lot more control given to users
Examples include wikis, blogs and working sites
Often highly customisable with a widget based approach.
WEB DESIGN AND PROGRAMMING
2  Simple Program: Printing a Line of Text in a Web Page
Inline scripting
Written in the <body> of a document
<script> tag
Indicate that the text is part of a script
type attribute
Specifies the type of file and the scripting language use
writeln method
Write a line in the document
Escape character ( \ )
Indicates “special” character is used in the string
alert method
Dialog box
WEB DESIGN AND PROGRAMMING
(1 of 1)
WEB DESIGN AND PROGRAMMING
(1 of 1)
WEB DESIGN AND PROGRAMMING
1 of 1
WEB DESIGN AND PROGRAMMING
1 of 1