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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/API/HTMLInputElement/multiple below:

HTMLInputElement.multiple - Web API | MDN

HTMLInputElement.multiple

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// fileInput is a <input type=file multiple>
let fileInput = document.getElementById("myfileinput");

if (fileInput.multiple == true) {
  for (let i = 0; i < fileInput.files.length; i++) {
    // Loop fileInput.files
  }

  // Only one file available
} else {
  let file = fileInput.files.item(0);
}