Javascript 将数字添加到 UInt8Array

Question

I have a 2 byte number (0 to 65,536) which I want to add to a UInt8Array. I can add a single byte number by directly referring to a index:

let bufarray = new Uint8Array(buffer);
bufarray[0] = 1;

But how can I add a 2 byte number to UInt8Array in Javascript/Typescript?

Answer 1

You have to split your two byte number into two individual bytes. This can be done by bitwise shifting.

 var twoBytes = 0xaaff; var byte1 = ((twoBytes >> 8) & 0xff); var byte2 = twoBytes & 0xff; console.log(byte1); console.log(byte2); var buffer = new ArrayBuffer(2); var Uint8View = new Uint8Array(buffer); Uint8View[0] = byte1; Uint8View[1] = byte2; var Uint16View = new Uint16Array(buffer); console.log(Uint16View[0]);

Answer 2

You can let the browser do the work for you:

var array16 = new Uint16Array([49238])
var array8 = new Uint8Array(array16.buffer);

bufarray[0] = array8[0];
bufarray[1] = array8[1];