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? , .

let decoder = new TextDecoder([label], [options]);

label , utf-8 , big5, windows-1251 .
options :
- fatal boolean, true, ( ) , ( ) \uFFFD.
- ignoreBOM boolean, true, BOM ( , ), .

decode:

let str = decoder.decode([input], [options]);

input (BufferSource) .
options :
- stream true , decoder . . TextDecoder , , .

let uint8Array = new Uint8Array([72, 101, 108, 108, 111]);

alert( new TextDecoder().decode(uint8Array) ); // Hello

let uint8Array = new Uint8Array([228, 189, 160, 229, 165, 189]);

alert( new TextDecoder().decode(uint8Array) ); //

, :

let uint8Array = new Uint8Array([0, 72, 101, 108, 108, 111, 0]);

//     
//   ,          .
//           .
let binaryString = uint8Array.subarray(1, -1);

alert( new TextDecoder().decode(binaryString) ); // Hello

TextEncoder

TextEncoder .

let encoder = new TextEncoder();

utf-8.

encode(str) Uint8Array, .
encodeInto(str, destination) (str) destination, Uint8Array.

let encoder = new TextEncoder();

let uint8Array = encoder.encode("Hello");
alert(uint8Array); // 72,101,108,108,111

TextDecoder TextEncoder

TextEncoder