Error:
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前端访问后端时出现如下报错：
Access to XMLHttpRequest at 'http://localhost:8000/api/slideshow' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
解决：
安装 CORS Middleware for Laravel. (fruitcake /laravel-cors)
The laravel-cors package allows you to send Cross-Origin Resource Sharing headers with Laravel middleware configuration.
https://github.com/fruitcake/laravel-cors
