如何在Jquery中将上传的文档显示为缩略图

<input type="file" id="fileInput">

$('#fileInput').on('change', function() {
  var file = this.files[0];
  var reader = new FileReader();
  
  reader.onload = function(e) {
    var thumbnail = $('<img>').attr('src', e.target.result);
    $('#thumbnailContainer').append(thumbnail);
  }
  
  reader.readAsDataURL(file);
});

<div id="thumbnailContainer"></div>

#thumbnailContainer img {
  width: 100px;
  height: 100px;
}