常见编码格式 / 字节序(大端 / 小端)/ 带BOM签名

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前言

在计算机中,我们如何表示数字,英文字母(A ~ Z / a ~ z),中文,符号(, .?<>),等各种符号呢?


常见的字符编码格式

ASCII

ANSI

GBK / GB-2312 / GB18030

Unicode

UTF


字节序标记

处理单元为多个字节时(一次拿到多个字节进行处理),如果不分字节顺序的话,那么就会出现解读错误。比如我们一次要处理四个字节 12 34 56 78,这四个字节是表示 0x12 34 56 78 还是表示 0x78 56 34 12?不同的解释最终表示的值也不一样。因此就有了大端方式和小端方式之分。

大端方式(Big endian)

小端方式(Little endian)


带BOM(签名)是什么意思?

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