JavaScript Загрузка файлов Blob

document.getElementById("myBtn").addEventListener("click", function() { 
 
  var reader = new FileReader(); 
  reader.addEventListener('load', function() { 
    document.getElementById('file').innerText = this.result; 
  }); 
  reader.readAsText(document.querySelector('input').files[0]); 
 
});

<input type="file"> 
<button id="myBtn">Try it</button> 
<pre id="file"></pre>

var input = "C:\katalog.xls";

var oReq = new XMLHttpRequest(); 
			 
	oReq.open("GET", "*.doc", true); 
	 
	//oReq.open("GET", jsonObject, true); 
	 
	oReq.responseType = "blob"; 
	 
	oReq.onload = function(oEvent) { 
	  var blob = oReq.response; 
	  insertFile(blob); 
	  // ... 
	}; 
 
	oReq.send();