laravel 中执行 php artisan migrate 报错

PS E:\codes\php\blog> php artisan migrate
Migration table created successfully.

   Illuminate\Database\QueryException  : SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key
length is 1000 bytes (SQL: alter table `users` add unique `users_email_unique`(`email`))

  at E:\codes\php\blog\vendor\laravel\framework\src\Illuminate\Database\Connection.php:664
    660|         // If an exception occurs when attempting to run a query, we'll format the error
    661|         // message to include the bindings with SQL, which will make this exception a
    662|         // lot more helpful to the developer instead of just the database's errors.
    663|         catch (Exception $e) {
  > 664|             throw new QueryException(
    665|                 $query, $this->prepareBindings($bindings), $e
    666|             );
    667|         }
    668| 

  Exception trace:

  1   PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 byte
s")
      E:\codes\php\blog\vendor\laravel\framework\src\Illuminate\Database\Connection.php:458

  2   PDOStatement::execute()
      E:\codes\php\blog\vendor\laravel\framework\src\Illuminate\Database\Connection.php:458

  Please use the argument -v to see more details.

这是由于你的 mysql 版本低造成的问题，如果版本在 5.7.7 以下，则会报这个错误，但是好像 8 也会报错

解决方法：在app\Providers\AppServiceProvider.php中的 boot 方法中添加代码

\Schema::defaultStringLength(191);