The picture has been deleted but it is still displayed. What should I do in this case? Is this a laravel problem or a browser problem? I restarted the browser and tried it, but it still didn't work. Sometimes I introduce a background image in the css, such asbackground-image: url("{{URL::asset('img/zan.png')}}" );When changing the picture without changing the picture name, the original picture will still be used after refreshing the browser