Homework2

 

Problem Describe：

Describe how to access the Internet. What are the providers? Define browsers and discuss URLs, HTML, javascript, AJAX, applets, and mobile browsers.

 

Answer：

Introduction：

The Internet is often referred to as the Information Superhighway because it connects millions of people across the globe.

Unlike a typical highway, the Internet moves idea and information.

The Web provides an easy-to-use, intuitive interface to connect to the Internet and is used by millions of people every day.

 

The Internet and the Web：

Large network that connects smaller networks globally

The Internet was Launched in 1969

——National computer network

——US funded project called ARPANET

World Wide Web or WWW  was introduced in 1992 at CERN

 

Common Internet Uses：

Communicating

——Exchange e-mail

——Discussion Groups

Online shopping

Searching

——Virtual Libraries

Entertainment

Education or e-learning

 

Internet Access Providers：

Common way to access the Internet

Commercial Internet Service Providers (ISP)

——National Service Providers

——Regional Service Provider

——Wireless service providers

 

Browsers：

Programs that provide access to Web resources

Allow you to surf the Internet

Three well-known browsers

——Mozilla Firefox

——Netscape Communications

——Microsoft Internet Explorer

Address or location of the resource must be specified

——URL

 

URLs：

Uniform Resource Locators

——All URLs have at least two parts

*Protocol

*Domain name

Locates Web sites

 

HTML：

Hypertext markup language, an application under standard general markup language.

"Hypertext" means that the page can contain pictures, links, even non - text elements such as music, programs and so on.

 

javascript：

javascript a literal scripting language, a dynamic type, a weak type, a prototype based language, and a built-in support type. Its interpreter is called the javascript engine, which is widely used in the client's scripting language as part of the browser.

 

AJAX：

Ajax(Asynchronous javascript And xml) refers to a web development technology that creates interactive web applications.

Ajax is a technology for creating fast dynamic web pages.

Ajax is a technology that can update some web pages without reloading the entire web page.

By exchanging a small amount of data in the background and the server, Ajax can make the web page update asynchronously. This means that a part of the web page can be updated without reloading the entire web page.

 

applets：

applet is a small application written in Java programming language. The program can be included in HTML (Standard General Markup Language Application) page, and is similar to the way of containing images in pages.

 

Mobile browser：

Mobile browsers, also called mini browsers, mini browsers or wireless Internet browsers, are web browsers designed for mobile devices, such as mobile phones or PDA. The mobile browser optimizes the content of the web page in a small screen of handheld devices. Mobile browser software must be very small and efficient to adapt to low memory and low bandwidth of wireless handheld devices. In typical cases, they are simplified web browsers, but by 2006, mobile browsers can handle more recent technologies, such as CSS 2.1, javascript and Ajax. Web sites specially designed for these browsers are called wireless portals.

 

 

 

Finally：

How to access Internet: through a Commercial Internet Service Provider Providers: ISP (Internet Service Provider) provide connection to internet. Use telephone lines, cables or wireless connections ex: AT&T, Sprint, Verizon Define Browsers: programs that provide access to Web resources ex: Mozilla Firefox, Apple Safari, Microsoft internet explorer, Google Chrome URLs: (Uniform Resource Locator) Have at least protocol(http:) and domain(mtv.com) name. TLD(Top Level Domain) identifies the type of organization (.com,.edu,.mil,.gov,.net) HTML: Browsers interpret the HTML(Hypertext Markup Language) commands and they contain formatting instructions for displaying document as a web page. The hyperlink connects to other web pages like text and graphic images and files javascript: An interactive website & language used for interactive features AJAX: interactive website & advanced use of java script

applets: interactive website & programs that can be downloaded quickly and present animations, display graphics and provide interactive games