无法设置反应环境

Question

我正在学习ReactJS，并尝试按照video

设置环境

但是在cmd中执行“ npm run it”命令时出现错误。 这是package.json文件： { "name": "react-folder", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "it": "webpack-dev-server --hot" }, "author": "", "license": "ISC", "devDependencies": { "babel-preset-react": "^6.24.1", "webpack": "^4.29.3", "webpack-dev-server": "^3.1.14" }, "dependencies": { "react": "^16.8.1", "react-dom": "^16.8.1" } }

Errors

Answer 1

npm install webpack-cli（如果您使用的是npm的旧版本，请使用npm install webpack-cli --save，也可以使用npx create-react-app AppName轻松创建react应用

Answer 2

第一次尝试安装webpack-cli，因为现在必须运行webpack。

npm i -D webpack-cli