Laravel Mix本身不支持构建选定的资产，因为运行npm run dev或npm run prod将触发webpack.mix.js中定义的所有任务。您可以定义一个环境变量来指定您想要构建的应用：

const mix = require('laravel-mix');
const appName = process.env.APP_NAME;
if (!appName || appName === 'the_first') {
    mix.js('resources/assets/js/app_the_first.js', 'public/js').vue()
       .sass('resources/assets/sass/app_the_first.scss', 'public/css');
}
if (!appName || appName === 'the_second') {
    mix.js('resources/assets/js/app_the_second.js', 'public/js').vue()
       .sass('resources/assets/sass/app_the_second.scss', 'public/css');
}

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然后，您可以在运行npm脚本时使用环境变量来指定要编译的应用程序：

APP_NAME=the_first npm run dev
APP_NAME=the_second npm run dev
npm run dev

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修改你的package.json脚本以包含这些新命令：

"scripts": {
  "dev": "npm run development",
  "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --config=node_modules/laravel-mix/setup/webpack.config.js",
  "watch": "npm run development -- --watch",
  "watch-poll": "npm run watch -- --watch-poll",
  "hot": "cross-env NODE_ENV=development webpack-dev-server --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
  "prod": "npm run production",
  "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --config=node_modules/laravel-mix/setup/webpack.config.js",
  "dev-first": "cross-env APP_NAME=the_first npm run dev",
  "prod-first": "cross-env APP_NAME=the_first npm run production",
  "dev-second": "cross-env APP_NAME=the_second npm run dev",
  "prod-second": "cross-env APP_NAME=the_second npm run production"
},

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现在，您可以使用npm run dev-first仅编译第一个应用程序的资产，而npm run dev-second用于第二个应用程序。
如果你没有安装cross-env，你可以使用以下命令安装：

npm install --save-dev cross-env

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