字符串转换为字节数组、16进制转换为base64、base64转换为字符串数组、base64转换为16进制（微信小程序）

1、字符串转换为字节数组

// 字符串转为字节数组
function stringToByteArray(str) {var array = new Uint8Array(str.length);for (var i = 0; i < str.length; i++) {array[i] = str.charCodeAt(i);}return array;
}

2、16进制转换为base64

// 16进制转换为base64
function HexToBase64(sha1) {var digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"var base64_rep = ""var ascvvar bit_arr = 0var bit_num = 0for (var n = 0; n < sha1.length; ++n) {if (sha1[n] >= 'A' && sha1[n] <= 'Z') {ascv = sha1.charCodeAt(n) - 55} else if (sha1[n] >= 'a' && sha1[n] <= 'z') {ascv = sha1.charCodeAt(n) - 87} else {ascv = sha1.charCodeAt(n) - 48}bit_arr = (bit_arr << 4) | ascvbit_num += 4if (bit_num >= 6) {bit_num -= 6base64_rep += digits[bit_arr >>> bit_num]bit_arr &= ~ (-1 << bit_num)}}if (bit_num > 0) {bit_arr <<= 6 - bit_numbase64_rep += digits[bit_arr]}var padding = base64_rep.length % 4if (padding > 0) {for (var n = 0; n < 4 - padding; ++n) {base64_rep += "="}}return base64_rep
}

3、base64转换为字符串数组

https://www.npmjs.com/package/base64-arraybuffer

const base64ToArrayBuffer = require('base64-arraybuffer')// base64转换为字符串数组
export function base64ToArrayBufferFn(base64) {return base64ToArrayBuffer.decode(base64)
}

4、base64转换为16进制（微信小程序）

// base64转为16进制
function base64ToHex(base64Str) {const binaryStr = weAtob(base64Str);// 创建一个Uint8Array来存储二进制数据const uint8Array = new Uint8Array(binaryStr.length);for (let i = 0; i < binaryStr.length; i++) {uint8Array[i] = binaryStr.charCodeAt(i);}// 使用toString方法将二进制数据转换为十六进制[字符串]let hexStr = ''for (let i = 0; i < uint8Array.length; i++) {const hex = uint8Array[i].toString(16).padStart(2, '0');hexStr += hex;}return hexStr;
}

5、base64转换为16进制（非小程序）

// base64转为16进制
function base64ToHex(base64Str) {const binaryStr = atob(base64Str);// 创建一个Uint8Array来存储二进制数据const uint8Array = new Uint8Array(binaryStr.length);for (let i = 0; i < binaryStr.length; i++) {uint8Array[i] = binaryStr.charCodeAt(i);}// 使用toString方法将二进制数据转换为十六进制[字符串]let hexStr = ''for (let i = 0; i < uint8Array.length; i++) {const hex = uint8Array[i].toString(16).padStart(2, '0');hexStr += hex;}return hexStr;
}