javascript - 将 HTML5 文本区域内容保存到文件

Question

有人可以帮我将 HTML5 textArea 的内容保存到文件中，最好使用 JavaScript 吗？

<textarea id="textArea">
   Notes here...
</textarea>
<button type="button" value="save"> Save</button>

Answer 1

应该这样做。

function saveTextAsFile() {
  var textToWrite = document.getElementById('textArea').innerHTML;
  var textFileAsBlob = new Blob([ textToWrite ], { type: 'text/plain' });
  var fileNameToSaveAs = "file.txt"; //filename.extension

  var downloadLink = document.createElement("a");
  downloadLink.download = fileNameToSaveAs;
  downloadLink.innerHTML = "Download File";
  if (window.webkitURL != null) {
    // Chrome allows the link to be clicked without actually adding it to the DOM.
    downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
  } else {
    // Firefox requires the link to be added to the DOM before it can be clicked.
    downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
    downloadLink.onclick = destroyClickedElement;
    downloadLink.style.display = "none";
    document.body.appendChild(downloadLink);
  }

  downloadLink.click();
}

var button = document.getElementById('save');
button.addEventListener('click', saveTextAsFile);

function destroyClickedElement(event) {
  // remove the link from the DOM
  document.body.removeChild(event.target);
}

#textArea {
  display: block;
  width: 100%;
}

<textarea id="textArea" rows="3">
   Notes here...
</textarea>
<button type="button" value="save" id="save">Save</button>

JSFiddle