simple xhr request

xhr.js

export const request = (url) => {
    const xhr = new XMLHttpRequest()
    const process = (method, body) => {
        xhr.open(method, url, true)
        xhr.setRequestHeader('Content-Type', 'application/json;charset=UTF-8')
        xhr.send(body)
        return new Promise((resolve, reject) => {
            xhr.onreadystatechange = xhr.onerror = () => {
                if (xhr.readyState === XMLHttpRequest.DONE) xhr.status >= 200 && xhr.status < 300 ?
                    resolve(JSON.parse(xhr.responseText)) : reject(xhr.responseText)
            }
            xhr.ontimeout = () => reject('The request is timed out.')
        })
    }
    return ['post', 'get']
        .map((k) => ({ [k]: (body) => process(k, body) }))
        .reduce((acc, v) => Object.assign(acc, v), {})
}