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                # `webpack`結合`npm scripts` 我們后面會不斷的修改項目文件,每次修改完要重新執行`webpack src/main.js -o dist/bundle.js`命令。感覺 命令比較長,比較繁瑣。 ## 安裝本地項目依賴 >[success] 因為一個項目往往依賴特定的webpack版本,全局的版本可能很這個項目的webpack版本不一致,導出打包出現問題。 > 所以通常一個項目,都有自己局部的webpack。 `npm install webpack webpack-cli -D` ~~~ { "name": "demo1", "version": "1.0.0", "dependencies": { "jquery": "^3.4.1" }, "devDependencies": { "webpack": "^4.35.0", "webpack-cli": "^3.3.5" } } ~~~ ## npm scripts 我們可以結合`npm scripts`來方便我們書寫命令。修改`package.json`文件如下: ~~~ { "name": "demo1", "version": "1.0.0", "scripts": { "start": "webpack src/main.js -o dist/bundle.js" }, "dependencies": { "jquery": "^3.4.1" }, "devDependencies": { "webpack": "^4.35.0", "webpack-cli": "^3.3.5" } } ~~~ ## 啟動命令 `npm start 或者npm run start` ## 解釋 `npm run xxx` 這其中的`xxx`就是我們在scripts中定義的key值。 這樣一句命令代表著我們將xxx的值執行。即執行`webpack src/main.js -o dist/bundle.js`。 這里面的`webpack`命令其實是利用的我們項目的開發環境的的`webpack-cli`模塊。如果本地項目未完裝`webpack`、`wepback-cli`則去找全局命令。 ## 注意 > start這個命令可以省去run其它都不可以 ## 問題 上面命令執行后是可以進行打包,不過會產生一個警告提示。按照提示添加mode屬性要么為production(生產環境)或者development 開發環境 。我們在這里了解一下開發環境。所以將mode屬性的值設置為development; ~~~ > demo1@1.0.0 start C:\Users\zhaoy\Desktop\react\01\demo1 > webpack src/main.js -o dist/bundle.js Hash: 4e6df5b73ef9caaba844 Version: webpack 4.35.0 Time: 329ms Built at: 2019-06-24 7:36:41 PM Asset Size Chunks Chunk Names bundle.js 87.6 KiB 0 [emitted] main Entrypoint main = bundle.js [1] ./src/main.js 106 bytes {0} [built] + 1 hidden module WARNING in configuration The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option t o 'development' or 'production' to enable defaults for each environment. You can also set it to 'none' to disable any default behavior. Learn more: https://webpack.js.org/configurati on/mode/ ~~~ **修改npm scripts** ~~~ webpack src/main.js -o dist/bundle.js --mode development ~~~ ~~~ { "name": "demo1", "version": "1.0.0", "scripts": { "start": "webpack src/main.js -o dist/bundle.js --mode development" }, "dependencies": { "jquery": "^3.4.1" }, "devDependencies": { "webpack": "^4.35.0", "webpack-cli": "^3.3.5" } } ~~~ ## 項目源碼 `git clone https://github.com/highh5/webpack.git -b lesson-02`
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