在Javascript中显示文件输入的图像

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

const fileInput = document.getElementById('fileInput');
fileInput.addEventListener('change', handleFileSelect);

function handleFileSelect(event) {
  const file = event.target.files[0];

  const reader = new FileReader();
  reader.onload = handleFileLoad;
  reader.readAsDataURL(file);
}

function handleFileLoad(event) {
  const img = document.createElement('img');
  img.src = event.target.result;

  document.body.appendChild(img);
}