SOURCE

function jsonp(options) {
  
  /*
  	options {
    	url, // string
    	data, // {}
      callback, // string
      onSuccess, // fn
    }
  
  */
  
  options = options || {};
  options.data = options.data || {};
  options.data.callback = options.callback;

  var data = [];
	for(var key in options.data) {
    data.push(`${encodeURIComponent(key)}=${encodeURIComponent(options.data[key])}`);
  }
  var query = data.join('&');
  var src = `${options.url}${options.url.indexOf('?') > -1 ? '&': '?'}${query}`;
  
  var headEl = document.querySelector('head');
  var scriptEl = document.createElementByTag('script');
  scriptTag.src = src;
  
  window[options.callback] = function(...args) {
    headEl.removeChild(scriptEl);
    delete window[options.callback];
    
    if(typeof options.onSuccess === 'function') {
      options.onSuccess(...args);
    }
  }
  
  headEl.appendChild(scriptEl);
}