Node.js stringDecoder.end()用法及代碼示例

stringDecoder.end()方法用於返回存儲在內部緩衝區中的所有剩餘輸入作為字符串。此方法確保將所有不完整的UTF-8和UTF-16字符替換為適合字符編碼的替換字符。

提供可選的buffer參數後，stringDecoder.write()在返回剩餘的緩衝區輸入之前，對數據調用一次方法。

用法:

stringDecoder.end( [buffer] )

參數：該函數接受上述和以下描述的單個參數：

buffer:它是一個Buffer，TypedArray或DataView，其中包含必須解碼的字節。它是一個可選參數。

返回值：它以字符串形式返回存儲在緩衝區中的其餘輸入。

以下示例程序旨在說明Node.js中的stringDecoder.end()方法：

範例1：

// 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 additonal call to write() 
// using the last part of the buffer 
console.log(decoder.end(Buffer.from([0xAC])));

輸出：

Decoded Text:GeeksforGeeks
Decoding the Euro Symbol:


€

範例2：

// 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);

輸出：

Complete Cent Symbol:¢
Cent Symbol using write():
Cent Symbol using end():??

參考： https://nodejs.org/api/string_decoder.html#string_decoder_stringdecoder_end_buffer

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注：本文由純淨天空篩選整理自sayantanm19大神的英文原創作品 Node.js | stringDecoder.end() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。