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/
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/