The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.

以上的警告指的是沒(méi)有設(shè)定是開(kāi)發(fā)模式還是生產(chǎn)模式,要求指定.

只需要在項(xiàng)目中的package.json中script中配置上

?"dev": "webpack --mode development",? ? "build": "webpack --mode production" 兩句即可

使用方法在cmd中輸入 npm run dev (開(kāi)發(fā)環(huán)境輸出的index.js沒(méi)有壓縮)?

npm run build (生產(chǎn)模式輸出的index.js壓縮過(guò), ps:此時(shí)只要index.html和index.js2個(gè)文件就可正常輸出顯示) ? ??

/以下本人完整package.json文件源碼供參考

{
? "name": "reactapp",
? "version": "1.0.0",
? "description": "good",
? "main": "index.js",
? "scripts": {
? ? "start": "webpack-dev-server",
? ? "dev": "webpack --mode development",
? ? "build": "webpack --mode production"
? },
? "author": "",
? "license": "ISC",
? "dependencies": {
? ? "babel-core": "^6.26.0",
? ? "react": "^16.3.1",
? ? "react-dom": "^16.3.1"
? }
}

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