npm start 什么都不做 / localhost:3000 連接被拒絕

Question

我嘗試在這里運行一些不同的教程，但得到了相同的結果。 npm start 什么都不做。 沒有錯誤，什么都沒有。 嘗試打開 localhost:3000 並拒絕連接。

如果我在同一台計算機上更改為不同的用戶，它就可以正常工作。 任何想法如何在不丟失每個應用程序和密碼的所有其他設置的情況下重置它。

我通過全新安裝的 React 和 React 網站上的基本 tic tac toe 以及其他一些網站進行了嘗試。

我在 vscode 中工作，但我也直接從終端嘗試過。 將默認瀏覽器設置為 chrome。 嘗試按照本教程https://reactjs.org/tutorial/tutorial.html 進行操作。 很簡單的東西。 只是似乎不起作用

節點 -v v14.10.1 npm -v 6.14.8

在終端中運行此代碼：

npx create-react-app my-app
cd my-app
npm start

這是結果：

peterfaretra@Peters-MacBook-Pro React % npx create-react-app my-app
npx: installed 98 in 10.58s

Creating a new React app in /Users/peterfaretra/Sites/React/my-app.

Installing packages. This might take a couple of minutes.
Installing react, react-dom, and react-scripts with cra-template...

+ react-scripts@3.4.3
+ react-dom@16.13.1
+ cra-template@1.0.3
+ react@16.13.1
added 1605 packages from 755 contributors and audited 1605 packages in 173.919s

69 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities


Initialized a git repository.

Installing template dependencies using npm...
npm WARN tsutils@3.17.1 requires a peer of typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta but none is installed. You must install peer dependencies yourself.

+ @testing-library/jest-dom@4.2.4
+ @testing-library/user-event@7.2.1
+ @testing-library/react@9.5.0
added 36 packages from 57 contributors and audited 1641 packages in 12.107s

69 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

Removing template package using npm...

npm WARN tsutils@3.17.1 requires a peer of typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta but none is installed. You must install peer dependencies yourself.

removed 1 package and audited 1640 packages in 6.202s

69 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities


Created git commit.

Success! Created my-app at /Users/peterfaretra/Sites/React/my-app
Inside that directory, you can run several commands:

  npm start
    Starts the development server.

  npm run build
    Bundles the app into static files for production.

  npm test
    Starts the test runner.

  npm run eject
    Removes this tool and copies build dependencies, configuration files
    and scripts into the app directory. If you do this, you can’t go back!

We suggest that you begin by typing:

  cd my-app
  npm start

Happy hacking!
peterfaretra@Peters-MacBook-Pro React % 
peterfaretra@Peters-MacBook-Pro React % cd my-app 
peterfaretra@Peters-MacBook-Pro my-app % npm start
peterfaretra@Peters-MacBook-Pro my-app % 

Answer 1

我可以從您的控制台/終端看到該項目已在

/Users/peterfaretra/Sites/React/my-app

但是當我看到下面的

peterfaretra@Peters-MacBook-Pro React % 
peterfaretra@Peters-MacBook-Pro React % cd my-app 
peterfaretra@Peters-MacBook-Pro my-app % npm start
peterfaretra@Peters-MacBook-Pro my-app % 

我不是 mac 用戶，所以我不能自信地說，但我在上述路徑中的任何地方都看不到/sites路徑。 基本上，如果我必須運行我的項目，我的目錄將是/Users/peterfaretra/Sites/React/my-app然后

npm start.