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如何判断写入流结束?

用流的方式,来读写文件,

const write = fs.createWriteStream(path2)
const read = fs.createReadStream(path1)
write.on('close',()=>{
  console.log('ccc')
  console.log(write.closed)
})
// read.setEncoding('utf-8')
// read.resume()
read.on('data', data => {
  console.log('正在读');
})
read.on('end', () => { //监听状态
 console.log('文件读取结束');
  write.end()   //在这里把写入流关闭,能否保证内容是否全写完了

})
read.pipe(write)

读取结束的时候,可以用on 监听 end 那如何判断何时写入完毕呢? 在end里面把写入流关闭,能否保证内容是否全写完了


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