$ npm i superagent-charset --save

const request = require('superagent')
require('superagent-charset')(request)

const should = require('should')
const request = require('superagent')
require('superagent-charset')(request) // install charset

describe('Basic Test', function() {
  it('it works', function(done) {
    request.get('http://www.sohu.com/')
      .charset('gbk')
      .end((err, res) => {
        res.text.should.match(/搜狐/)
        done(err)
      })
  })
})