javascript - 读取所有目录条目内容

Question

我正在尝试读取目录条目中的所有条目。我可以做到这一点，但我不确定将完全完成后应该发生的代码放在哪里。这就是我所拥有的:

function readcontents(folder, callback) {
  var contents = []
  function readsome(reader) {
    reader.readEntries(function(entries) {
      for(var entry of entries) {
        if(entry.isDirectory) {
          readsome(entry.createReader())
        } else {
          contents.push(entry)
        }
      }
      if(entries.length) {
        readsome(reader)
      }
    })
  }
  readsome(folder.createReader())
}

Answer 1

我能够通过保留计数器来确定它何时完成。

function readcontents(folder, callback) {
  var reading = 0
  var contents = []
  function readsome(reader) {
    reading = reading + 1
    reader.readEntries(function(entries) {
      reading = reading - 1
      for(var entry of entries) {
        if(entry.isDirectory) {
          readsome(entry.createReader())
        } else {
          contents.push(entry)
        }
      }
      if(entries.length) {
        readsome(reader)
      } else if(reading == 0) {
        callback(contents)
      }
    })
  }
  readsome(folder.createReader())
}
readcontents(folder, function(files) {
  console.log(files)
})