Failed at the @ watch script 'cross-env NODE_ENV=development 使用cross-env解决跨平台设置NODE_ENV的问题

今天在安装js依赖包时，根目录的package.json：

{
  "private": true,
  "scripts": {
    "dev": "$npm_package_scripts_development",
    "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "watch": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "watch-poll": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --watch-poll --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
    "prod": "$npm_package_scripts_production",
    "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
  },
  "devDependencies": {
    "axios": "^0.15.3",
    "bootstrap": "^3.3.7",
    "cross-env": "^3.2.3",
    "jquery": "^3.1.1",
    "laravel-mix": "0.*",
    "lodash": "^4.17.4",
    "swiper": "^3.4.2"
  },
  "dependencies": {
    "cross-env": "^3.2.4"
  }
}

在执行nmp install时出现以下错误

谷歌了下这个cross-env迷你的包能够提供一个设置环境变量的scripts，让你能够以unix方式设置环境变量，

安装使用方法：

• 安装cross-env: npm install cross-env --save-dev

• 在NODE_ENV=xxxxxxx前面添加cross-env就可以了(本例中已经加了cross-env)。
  在此执行npm install，ok 正常