TAILIEUCHUNG - creating cool web sites with html xhtml and css apr 2004 phần 2

Để tính toán tương đương với số thập phân của một số thập lục phân, nhân mỗi số cơ sở nâng lên sức mạnh thích hợp. Hex 20, do đó, sẽ là 2 × 16 + 0 × 1, hoặc 32 quyết mal. (Đừng lo lắng nếu điều này không có ý nghĩa, bạn sẽ có thể không bao giờ cần đến con số này ra Chỉ cần nhớ để kiểm tra Bảng 1-1 cho tương đương hex phổ biến nhất.) | Chapter 1 So What s All This Web Jazz To compute the decimal equivalent of a hexadecimal number multiply each number by the base raised to the appropriate power. Hex 20 therefore would be 2 X 16 0 X 1 or 32 decimal. Don t worry if this doesn t make sense you ll probably never need to figure this out. Just remember to check Table 1-1 for the most common hex equivalents. Table 1-1 shows the special URL forms of some common characters that you may encounter while building URL specifications. To keep the Web browser from getting confused use a code for the percent sign itself. Almost perverse eh Table 1-1 URL Coding for Common Characters Character Hex Value Equivalent URL Coding Space 20 20 Tab 09 09 Percent 25 25 E-mail via URL URLs for e-mail are quite simple fortunately and require minimal explanation. You can specify any e-mail address as a URL simply by prefacing the snippet mailto as the service name as in the following example mailto taylor@ Again make sure that you don t use spaces in the URL. Note that you can send e-mail in a URL but you cannot retrieve it. Why use an e-mail address as a URL Because it s nice to have an e-mail webmaster link or something similar on your site and mailto is the URL that allows your users to e-mail the webmaster. A bit later in the section about hypertext references you see how this type of e-mail address URL is a powerful addition to your regular page links. 1 Almost on tmtooK o omomm Htm .-mol sssvloss. note Almost all browsers launch a separate e-mail program to handle e-mail services. T Telnet via URL Another service along with the unquestionably valuable FTP that caused Internet use to explode is Telnet. Telnet gives everyone on the Net the capability to log in to other computers on the Net just as though they were connected to those machines directly. Not all Internet computers support Telnet but many do. 18 Creating Cool Web Sites with HTM L XHTM L and CSS Telnet you will be glad to know is easy to specify in

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