webpack官網：https://webpack.js.org/ 全局安裝webpack cnpm i -g webpack webpack-cli 創建index.js console.log('hellowebpack')//示例：建議寫es5語法可正常運行，es6需要babel後面做筆記會寫 cmd運行 webpack index.js//------生成文件夾dist，生成文件main.
