平面

Encoding & Standards

由65,536个连续Unicode码位构成的分组。第0平面为基本多文种平面（BMP），大多数表情符号位于第1平面（SMP）。

Unicode divides its 1,114,112 code points into 17 planes of 65,536 code points each (Planes 0 through 16). The first plane, Plane 0 (U+0000 to U+FFFF), is the Basic Multilingual Plane (BMP) containing most common scripts.

Plane 1 (U+10000 to U+1FFFF) is the Supplementary Multilingual Plane (SMP), where most emoji are allocated. Planes 2 and beyond contain supplementary CJK characters and reserved space.

The BMP/SMP distinction matters because characters in the BMP can be represented with a single UTF-16 code unit, while SMP characters (including emoji) require surrogate pairs.

相关术语

代理对 代理对
用于表示U+FFFF以上字符的两个UTF-16编码单元组合，由高代理（U+D800-U+DBFF）和低代理（U+DC00-U+DFFF）构成。 码位 码位
Unicode标准中分配给每个字符的唯一数值，以U+XXXX格式表示（例如😀对应U+1F600）。 补充多文种平面（SMP） (SMP) 补充多文种平面（SMP） (SMP)
Unicode第1平面（U+10000至U+1FFFF），绝大多数表情符号码位都分配在此区域。

相关工具

🔢 Unicode 查询 Unicode 查询
输入 U+1F600 等码位，获取表情符号、编码详情、UTF-8/16 字节和 HTML 实体。

相关故事

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