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引言 1993年底,NCSA在Internet上广泛地免费分发Mosaic,引发了WorldWide Web持续至今的呈指数型的增长。今天,Web已对Internet通信起着根本性的影响,每天都有上千万人访问Web以获取各类信息,Internet迅速地从以教育、科研为中心转移到了以商业为中心,电子商务、消费网络成为时髦,网络蕴藏着无限商机。与此同时,随着WWW用户的不断增加,用户对网络的期望和要求也越来越高,已不再满足于单一的静态媒体,将文字、声音、图像、视频等多种媒
Introduction By the end of 1993, NCSA widely distributed free Mosaic on the Internet, triggering the exponential growth of the WorldWide Web so far. Today, the Web has a fundamental impact on Internet communications. Every day, tens of millions of people visit the Web to access all kinds of information. The Internet has rapidly shifted from education and research to business-centered, e-commerce, and consumer The network has become fashionable, the network contains unlimited business opportunities. At the same time, with the continuous increase of WWW users, the users’ expectations and demands on the network are also getting higher and higher. They are no longer satisfied with a single static media. Various media such as text, sound, image, video and the like