Vue CLI Service 命令无法识别：解决方法和步骤

It seems that the command 'vue-cli-service serve --open' is not recognized by the system. This usually happens when the Vue CLI is not installed or is not properly configured. Here's how to fix it:

Install Vue CLI: Run the following command to install the latest version of Vue CLI globally:
```
npm install -g @vue/cli
```
Navigate to Your Project Directory: Open your terminal or command prompt and navigate to the directory where your Vue project is located.
Start the Development Server: Once you're in the project directory, run the following command to start the development server:
```
vue serve
```

If the problem persists, make sure that you have the correct environment variables set up and that you have the latest versions of Node.js and npm installed.