谁能帮我计算一个快速端口随机器的数学

Question

My bot has been corrupting data and randomly crashing and found the problem, it was this bit of code:

Math.floor(Math.random()*6000)

Can anyone help me with this? Also, here is my entire express.js file:

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send('DSB is online')
})

app.listen(port, () => {
  console.log(`BOT listening at http://localhost:${port}`)
})

It says 3000 because that's the original one. I've changed it and that's almost what it says.

Answer 1

You can change the random number to have a minimum value. As CertainPerformance mentioned in their comment it's a good idea to start at 1000 (or maybe 1024) and not zero. Your current code will return with a number between 0 and 6000 (inclusive of 0 but not 6000).

The following function will generate a random integer between a min and max value.

function randomInt(min = 1024, max = 6000) {
  if (min > max) {
    [min, max] = [max, min]
  }
  return Math.floor((Math.random() * ((max - min) + 1)) + min)
}

randomInt() // => 5302

And you can use it like this:

app.get('/', (req, res) => {
  res.send('DSB is online')
})

const server = app.listen(randomInt(), () => {
  console.log(`BOT listening on port ${server.address().port}`)
  // => BOT listening on port 5981
})

In Express, if you want to randomly assign a port, you can simply listen on port 0 :

app.get('/', (req, res) => {
  res.send('DSB is online')
})

const server = app.listen(0, () => {
  console.log(`BOT listening on port ${server.address().port}`)
  // => BOT listening on port 58319
});