基本上，您将在服务器选项上将middlewareMode设置为ssr：

const fs = require('fs')
const path = require('path')
const express = require('express')
const { createServer: createViteServer } = require('vite')

async function createServer() {
  const app = express()

  // Create Vite server in middleware mode. This disables Vite's own HTML
  // serving logic and let the parent server take control.
  //
  // If you want to use Vite's own HTML serving logic (using Vite as
  // a development middleware), using 'html' instead.
  const vite = await createViteServer({
    server: { middlewareMode: 'ssr' }
  })
  // use vite's connect instance as middleware
  app.use(vite.middlewares)

  app.use('*', async (req, res) => {
    // serve index.html - we will tackle this next
  })

  app.listen(3000)
}

createServer()

**这在以下文档中进行了说明：**vitejs.dev/guide/ssr.html#setting-up-the-dev-server

更新维生素2.x

对于Vite 2.x，将server.middlewareMode设置为true，将appType设置为custom：

// ...
  const vite = await createViteServer({
    server: { middlewareMode: true },
    appType: 'custom'
  })

有关另一种方法，请参见此示例：https://github.com/frameable/vite-vue-express-example
这种方式支持在开发中使用HMR进行实时更新，并且在单个节点进程中运行，因此您不需要分别协调后端和开发服务器。