浏览器保存文件

File System Access API

<button onclick="saveFile()">保存文件</button>
<script>
  async function saveFile() {
    // create a new handle
    const newHandle = await window.showSaveFilePicker();
    // create a FileSystemWritableFileStream to write to
    const writableStream = await newHandle.createWritable();
    // write our file
    await writableStream.write("hello");
    // close the file and write the contents to disk.
    await writableStream.close();
  }
</script>