Very simple JSONP

vsjsonp.js

// VSJONP ― Very Simple JSONP
// ==========================
//
// Usage:
//   fetchJsonP({ 
//     url:      'http://shit-no-cors.json', 
//     complete: function(response) {
//       console.log(response);
//     }
//   });

(function() {
  var fetchJsonP = function(options) {
    var options = options ? options : {},
      script = document.createElement('script');
    functionName = 'jsonp' + Math.floor(Math.random() * 9999);
    window[functionName] = function(response) {
      if (options.complete) options.complete(response);
    }
    script.src = options.url + "&callback=" + functionName;
    script.onload = function() {
      document.body.removeChild(script);
      delete window[functionName];
    }
  };
  
  typeof module !== 'undefined' && 'exports' in module ?
    module.exports = fetchJsonP :
    window.fetchJsonP = fetchJsonP;
})();