use filereader javascript

1//HTML
2<input type='file' accept='image/*' onchange='openFile(event)'><br>
3<img id='output'>
4
5//Javascript
6var openFile = function(event) {
7  var input = event.target;
8
9  var reader = new FileReader();
10  reader.onload = function(){
11    var dataURL = reader.result;
12    var output = document.getElementById('output');
13    output.src = dataURL;
14  };
15  reader.readAsDataURL(input.files[0]);
16}

1 function displayImage(e) {
2        if (e.files[0]) {
3            var reader = new FileReader();
4            reader.onload = function(e) {
5                document.querySelector('#profileDisplay').setAttribute('src', e.target.result);
6            }
7            reader.readAsDataURL(e.files[0]);
8        }
9    }