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JS promise : wrapping XMLHttpRequest in Promise

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wrapping XMLHttpRequest in Promise

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  1. function callget(url){
  2. 	return new Promise(function(resolve,reject){
  3.         var oReq = new XMLHttpRequest();
  4.         oReq.open("GET", url);
  5.         oReq.onload = function(){
  6.             if(oReq.status ==200){
  7.                 resolve(oReq.response);
  8.             }
  9.             else{
  10. 				reject(oReq.statusText);
  11.             }
  12.         };
  13. 		oReq.error = function(){
  14.             reject('Network error');
  15.         };
  16.         oReq.send();
  17.  
  18.     });
  19. }
  20.  
  21.  
  22.  
  23. var jq = 'https://code.jquery.com/jquery-33.2.1.min.js';
  24. callget(jq).then(finish).catch(finish);
  25.  
  26. function finish(x){
  27. 	console.log(x);
  28. }

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