js猜测编码转换

chardet.js

var jschardet = require("jschardet")
var iconv = require('iconv-lite')

var data = Buffer.from('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', 'base64')

console.log(data)

// "àíàçã" in UTF-8
var res = jschardet.detect(data)
console.log(res)

console.log(res.encoding)

console.log(iconv.decode(data, res.encoding))