response.write(string|buffer)可以调用0-n次
response.end(string|buffer) 方法。必须调用一次

const http = require(‘http‘);
const fs = require(‘fs‘)
function readFileByPath(path) {
  return new Promise((resolve, reject) => {
    fs.readFile(path, (err, data) => {
      err ? reject(err) : resolve(data)
    })
  })
}

const server = http.createServer(async (request, response) => {

  const data = await readFileByPath(‘./static/1.txt‘)
  response.write(data) //可以write 文件流
  response.write(100 + ‘‘)
  response.write(‘你好‘)
  response.end(‘只能传string或者buffer(缓冲器)‘)

})
server.listen(3000)