Laravel10中提示了Target *classController does not exist，为什么呢？
原因是：laravel8开始写法变了。换成了新的写法了
解决方法一：
在路由数组加入App\Http\Controllers\即可。

    <?phpuse Illuminate\Support\Facades\Route;Route::get('/', [App\Http\Controllers\IndexController::class, 'index'])->name('admin.index.index');?>

再次访问URL，搞定。

解决方法二：

打开 app\Providers\RouteServiceProvider.php 修改,添加一个namespace变量

<?phpnamespace App\Providers;use Illuminate\Cache\RateLimiting\Limit;
use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\RateLimiter;
use Illuminate\Support\Facades\Route;class RouteServiceProvider extends ServiceProvider
{/*** The path to the "home" route for your application.** Typically, users are redirected here after authentication.** @var string*/public const HOME = '/home';/************此处添加*START**********************/    protected $namespace = 'App\Http\\Controllers\\Api';/************此处添加*END**********************//*** Define your route model bindings, pattern filters, and other route configuration.** @return void*/public function boot(){$this->configureRateLimiting();$this->routes(function () {Route::middleware('api')->prefix('api')/************此处添加*START**********************/  ->namespace($this->namespace)/************此处添加*END**********************/->group(base_path('routes/api.php'));Route::middleware('web')->group(base_path('routes/web.php'));});}/*** Configure the rate limiters for the application.** @return void*/protected function configureRateLimiting(){RateLimiter::for('api', function (Request $request) {return Limit::perMinute(60)->by($request->user()?->id ?: $request->ip());});}
}