Node.js stringDecoder.end()方法
原文:https://www . geesforgeks . org/node-js-stringdecoder-end-method/
stringDecoder.end()方法用于将存储在内部缓冲区中的所有剩余输入作为字符串返回。此方法确保任何不完整的 UTF-8 和 UTF-16 字符被替换为适合字符编码的替换字符。
当提供可选的缓冲区参数时，在返回剩余的缓冲区输入之前，将对数据调用一次 stringDecoder.write()方法。
语法:
stringDecoder.end( [buffer] )
参数:该功能接受如上所述的单个参数，描述如下:
- 缓冲区:它是一个包含必须解码的字节的缓冲区、类型数据区或数据视图。这是一个可选参数。
返回值:它以字符串形式返回存储在缓冲区中的剩余输入。 下面的程序说明了 Node.js 中的 stringDecoder.end() 方法:
例 1:
java 描述语言
// Import the string_decoder module
// and get the StringDecoder class
// using object destructuring
const { StringDecoder } = require("string_decoder");
const decoder = new StringDecoder("utf-8");
// Using the end() method
const text_one = Buffer.from("GeeksforGeeks", "utf-8");
let decoded_text = decoder.end(text_one);
console.log("Decoded Text:", decoded_text);
// The Euro Symbol is denoted using
// the bytes [0xE2, 0x82, 0xAC]
console.log("Decoding the Euro Symbol:");
// Decoding the euro symbol
// Using the write() method to
// write the first two parts
console.log(decoder.write(Buffer.from([0xE2])));
console.log(decoder.write(Buffer.from([0x82])));
// Finishing the symbol using the end() method
// with that gives an additional call to write()
// using the last part of the buffer
console.log(decoder.end(Buffer.from([0xAC])));
输出:
Decoded Text: GeeksforGeeks
Decoding the Euro Symbol:
€
例 2:
java 描述语言
// Import the string_decoder module
// and get the StringDecoder class
// using object destructuring
const { StringDecoder } = require("string_decoder");
const decoder = new StringDecoder("utf-8");
// The Cent Symbol is denoted using
// Buffer.from([0xc2, 0xa2])
// Decoding the complete cent symbol from buffer
let cent_symbol = Buffer.from([0xc2, 0xa2]);
let cent_symbol_out = decoder.end(cent_symbol);
console.log("Complete Cent Symbol:", cent_symbol_out);
// Decoding incomplete cent symbol using
// Buffer.write() method
cent_symbol = Buffer.from([0xc2]);
cent_symbol_out = decoder.write(cent_symbol);
console.log("Cent Symbol using write():",
cent_symbol_out);
// Decoding incomplete cent symbol
// using Buffer.end() method
cent_symbol = Buffer.from([0xc2]);
cent_symbol_out = decoder.end(cent_symbol);
console.log("Cent Symbol using end():",
cent_symbol_out);
输出:
Complete Cent Symbol: ¢
Cent Symbol using write():
Cent Symbol using end(): ??
参考:https://nodejs . org/API/string _ decoder . html # string _ decoder _ stringdecoder _ end _ buffer
版权属于：月萌API www.moonapi.com，转载请注明出处
