问答 大佬们这段代码为什么运行错误啊

[OneFive]

const str = "fuck";
      const buf = new TextEncoder("utf-16LE").encode(str);
      let file = hmFS.open('xxx.txt', hmFS.O_RDWR | hmFS.O_CREAT)
      hmFS.write(file, buf.buffer, 0, buf.length)
      hmFS.read(file, buf.buffer, 0, buf.length)
      const decoder = new TextDecoder('utf-16LE')
      const readStr = decoder.decode(buf)
      console.log(readStr)

新手瞎写的代码，问一下大佬们为什么运行不了🙂