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![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
len来自于fis.read(bys)的返回，代表的是从输入流读到了几个字节，即写了byte[]几个位，一般来说，这个len除了最后一次小于1024，其它时间都是等于1024.