text: export default function AjaxGet(url, callback) {
    if (typeof XDomainRequest !== 'undefined') {
      callback(null)
      return null
    }
    const xhr = new XMLHttpRequest()
    xhr.onreadystatechange = () => {
      if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
        callback(JSON.parse(xhr.responseText))
      }
    }
    xhr.open('GET', url, true)
    xhr.send()
    return xhr
  }
  