拖拽文件夹上传文件

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function traverseFileTree(item, path) {
  path = path || "";
  if (item.isFile) {
    // Get file
    item.file(function(file) {
      console.log("File:", path + file.name);
    });
  } else if (item.isDirectory) {
    // Get folder contents
    var dirReader = item.createReader();
    readerEntries(dirReader, path, item)
  }
}

// readEntries 每次最多返回100个，需要重复调用
// https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryReader/readEntries
functoin readerEntries (dirReader, path, item) {
  dirReader.readEntries(entries => {
    for (var i = 0; i < entries.length; i++) {
      traverseFileTree(entries[i], path + item.name + '/')
    }
    if (entries.length) readerEntries(dirReader, path, item)
  })
},

dropArea.addEventListener("drop", function(event) {
  event.preventDefault();

  var items = event.dataTransfer.items;
  for (var i=0; i<items.length; i++) {
    // webkitGetAsEntry is where the magic happens
    var item = items[i].webkitGetAsEntry();
    if (item) {
      traverseFileTree(item);
    }
  }
}, false);

兼容性

CanIUse

参考