【Express】防盗链

const express = require('express');
const app = express();
app.use((req, res, next) => {
  const referer = req.get('referer')
  // console.log(referer)
  if (referer) {
    const url = new URL(referer)
    const hostname = url.hostname
    if(hostname !== 'localhost') {
      res.status(404).send('
404 NOT FOUND
')
      return 
    }
  }
  next()
})
app.use(express.static(__dirname + '/public'))
app.listen(3000, () => {
  console.log('服务器启动成功')
})