字符串解码器

【String decoder】

源代码: lib/string_decoder.js

node:string_decoder 模块提供了一个 API，用于将 Buffer 对象解码为字符串，同时保留已编码的多字节 UTF-8 和 UTF-16 字符。可以通过以下方式访问它：

【The node:string_decoder module provides an API for decoding Buffer objects into strings in a manner that preserves encoded multi-byte UTF-8 and UTF-16 characters. It can be accessed using:】

const { StringDecoder } = require('node:string_decoder'); 拷贝

以下示例展示了 StringDecoder 类的基本用法。

【The following example shows the basic use of the StringDecoder class.】

const { StringDecoder } = require('node:string_decoder');
const decoder = new StringDecoder('utf8');

const cent = Buffer.from([0xC2, 0xA2]);
console.log(decoder.write(cent));

const euro = Buffer.from([0xE2, 0x82, 0xAC]);
console.log(decoder.write(euro)); 拷贝

当一个 Buffer 实例写入到 StringDecoder 实例时，会使用一个内部缓冲区来确保解码后的字符串不包含任何不完整的多字节字符。这些字符会被保存在缓冲区中，直到下次调用 stringDecoder.write() 或调用 stringDecoder.end()。

【When a Buffer instance is written to the StringDecoder instance, an internal buffer is used to ensure that the decoded string does not contain any incomplete multibyte characters. These are held in the buffer until the next call to stringDecoder.write() or until stringDecoder.end() is called.】

在下面的示例中，欧洲欧元符号（€）的三个 UTF-8 编码字节是通过三次独立的操作写入的：

【In the following example, the three UTF-8 encoded bytes of the European Euro symbol (€) are written over three separate operations:】

const { StringDecoder } = require('node:string_decoder');
const decoder = new StringDecoder('utf8');

decoder.write(Buffer.from([0xE2]));
decoder.write(Buffer.from([0x82]));
console.log(decoder.end(Buffer.from([0xAC]))); 拷贝