HTML5是否允许拖放拖放文件夹或文件夹树？

HTML5是否允许拖放拖放文件夹或文件夹树？

多亏了Chrome> = 21，现在才有可能。

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();    dirReader.readEntries(function(entries) {      for (var i=0; i<entries.length; i++) {        traverseFileTree(entries[i], path + item.name + "/");      }    });  }}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);