ASCII和Unicode有什么区别? [英] What's the difference between ASCII and Unicode?

问题描述

Unicode和ASCII的确切区别是什么?

What's the exact difference between Unicode and ASCII?

ASCII共有128个字符(扩展集中的256个字符).

ASCII has a total of 128 characters (256 in the extended set).

是否有Unicode字符的大小规格?

Is there any size specification for Unicode characters?

推荐答案

ASCII定义了128个字符，它们映射到数字0至127. Unicode定义(少于)2 ²¹ 个字符，类似地，它们映射到数字0-2 ²¹ (尽管当前并非所有数字都被分配，有些是保留的).

ASCII defines 128 characters, which map to the numbers 0–127. Unicode defines (less than) 2²¹ characters, which, similarly, map to numbers 0–2²¹ (though not all numbers are currently assigned, and some are reserved).

Unicode是ASCII的超集，数字0-1在ASCII中的含义与在Unicode中的含义相同.例如，数字65表示拉丁大写字母'A'".

Unicode is a superset of ASCII, and the numbers 0–127 have the same meaning in ASCII as they have in Unicode. For example, the number 65 means "Latin capital 'A'".

由于Unicode字符通常不适合一个8位字节，因此有很多方法可以将Unicode字符存储在字节序列中，例如UTF-32和UTF-8.

Because Unicode characters don't generally fit into one 8-bit byte, there are numerous ways of storing Unicode characters in byte sequences, such as UTF-32 and UTF-8.

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