Question

const { createServer } = require('http')
const { parse } = require('url')
const next = require('next')
const { join } = require('path')

const port = parseInt(process.env.PORT, 10) || 3000
const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()

app.prepare()
  .then(() => {
    createServer((req, res) => {
      const parsedUrl = parse(req.url, true)
      const rootStaticFiles = [
        '/manifest.json',
        '/sitemap.xml',
        '/favicon.ico',
        '/robots.txt',
        '/browserconfig.xml',
        '/site.webmanifest',
      ]
      if (rootStaticFiles.indexOf(parsedUrl.pathname) > -1) {
        const path = join(__dirname, 'static', parsedUrl.pathname)
        app.serveStatic(req, res, path)
      } else {
        handle(req, res, parsedUrl)
      }
    })
      .listen(port, (err) => {
        if (err) throw err
        console.log(`> Ready on http://localhost:${port}`)
      })
  })

运行时出现错误..

Answer 1

u必须传递对 swap 方法的引用，而不是对值的引用。

int a=10, b=20;
swap(&a, &b);

使用交换功能是否错误？

1 个答案: