tailieunhanh - Linux smart homes for dummies - part 10

Hệ thống nhúng là một phần của hệ thống lớn hơn và thực hiện một số chức năng của hệ thống đó. Nói một cách đơn giản khi một hệ tính toán (có thể là PC, PLC, vi xử lý, vi điều khiển, DSP, . ) được nhúng vào trong một sản phẩm hay một hệ thống một cách “hữu cơ” và thực hiện một số chức năng cụ thể của hệ thống thì ta gọi đó là một hệ thống nhúng. | Chapter 17 Using the Web Interface for Remote Control 303 Firefox Mozilla Opera and IE do not strictly enforce compliance with the HTML standard. But with the new standards becoming stricter with the rules about how pages are put together browsers will be less likely to accept code that doesn t conform to the HTML standard. So in general do it once do it right is a good guideline to follow. With that in mind I ve created a template to use for creating your Web pages . Whether the page is a static page or one created with Perl code on the fly to really take advantage of HTML you will have to know some HTML. You can also add JavaScript and Java but that s way over the top for just starting out sort of like hiring a NASA engineer to build a backyard birdhouse. A brief history of the Web and HTML The Web traces its history back to ideas from as long ago as 1945. The modern Web traces back to about 1989 when Sir Tim Berners-Lee proposed HyperText to CERN the European Organization for Nuclear Research . By 1993 one of the earliest graphical browsers Mosaic was first released. Later Mosaic would become Netscape. In 1994 the W3C World Wide Web Consortium was created to set the standards. Today users take HTML for granted because most users don t see it but every page is made up of it in some form. The Internet wouldn t be the Internet without HTML. If you want to learn the nitty-gritty details of the protocols visit the W3C Web site at . The W3C has all the details. I don t recommend visiting that site if you re just learning HTML but after you ve gotten a bit comfortable with HTML it might more sense. The first version of HTML that I can remember working with was . It was simple enough and I really didn t know what I was doing. I basically looked at other Web pages. When I saw a feature that I liked I tried to recreate that feature. Well apparently so did a lot of other people. Browsers began supporting various HTML code that didn t follow the .