Reactjs 反应页面不'；当我运行Npm Start时，不能在浏览器中更改live

我不确定这个标题的措辞是否正确，或者如何用词。通常，当我运行React应用程序时，我会在终端中运行

npm start

，并可以在浏览器上看到我的更改。但是对于这个项目，

npm start

本身会带来错误，我必须在开始之前运行

npm run build

，但是它不会在浏览器中给我实时的更改。我必须不断关闭服务器并重新启动，才能看到浏览器中的每一项更改

我忘记装东西了吗？我是个新手，我的搜索结果都没有什么好结果

以下是一些代码，如果有帮助的话：

// bin/www

var app = require('../app');
var debug = require('debug')('mean-app:server');
var http = require('http');
var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

var server = http.createServer(app);

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

function normalizePort(val) {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

function onListening() {
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);

.env:

package.json：

"scripts": {
    "start": "node ./bin/www",
    "build": "react-scripts build",
    "dev": "DEBUG=project-management-server:* nodemon ./bin/www" ,
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  },

---

将您的packages.json更改为

"scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "dev": "DEBUG=project-management-server:* nodemon ./bin/www" ,
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  },

只要您现在进行更改，运行“npm启动”应该会重新加载

"scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "dev": "DEBUG=project-management-server:* nodemon ./bin/www" ,
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  },