将Uint8Array转换为node.js中的十六进制字符串等效项

I am using node.js v4.5. Suppose I have this Uint8Array variable.

我正在使用node.js v4.5。假设我有这个Uint8Array变量。

var uint8 = new Uint8Array(4);
uint8[0] = 0x1f;
uint8[1] = 0x2f;
uint8[2] = 0x3f;
uint8[3] = 0x4f;

This array can be of any length but let's assume the length is 4.

这个数组可以是任何长度,但我们假设长度是4。

I would like to have a function that that converts uint8 into the hex string equivalent.

我想有一个函数,将uint8转换为十六进制字符串等效。

var hex_string = convertUint8_to_hexStr(uint8);
//hex_string becomes "1f2f3f4f"

2 个解决方案

#1

You can use Buffer.from() and subsequently use toString('hex'):

您可以使用Buffer.from()并随后使用toString('hex'):

let hex = Buffer.from(uint8).toString('hex');

#2

Another solution: reduce:

另一解决方案:减少:

uint8.reduce(function(memo, i) {
    return memo + ('0' + i.toString(16)).slice(-2); //padd with leading 0 if <16
}, '');

Or map and join:

或者地图和加入:

uint8.map(function(i) {
    return ('0' + i.toString(16)).slice(-2);
}).join('');