解决方法：
mkdir -p public/vendor/backpack/crud/img/
cp vendor/backpack/crud/src/public/crud/img/ajax-loader.gif public/vendor/backpack/crud/img/
laravel backpack 数据列表页 ajax-loader.gif 404 问题
文章目录
解决方法：
mkdir -p public/vendor/backpack/crud/img/
cp vendor/backpack/crud/src/public/crud/img/ajax-loader.gif public/vendor/backpack/crud/img/