@Zippo 也是字符集的问题吗？这个是答案嘛，下面这个Schema::defaultStringLength(191);是啥意思，能解释下不，我是新手，感谢

$ php artisan admin:install

In Connection.php line 664:

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

In PDOStatement.php line 144:

  SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was t
  oo long; max key length is 1000 bytes

In PDOStatement.php line 142:

  SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was t
  oo long; max key length is 1000 bytes

@lovecn

默认的数据库字符集，现在utf8mb4包括存储emojis支持。如果你运行MySQL v5.7.7或者更高版本，则不需要做任何事情。

use Illuminate\Support\Facades\Schema;

class AppServiceProvider extends ServiceProvider
{
    public function boot()
    {
        Schema::defaultStringLength(191);
    }
}

@Zippo 感谢大佬，成功了 在 博客：Laravel 5.4 常见错误：Specified key was too long 这里也找到答案

执行完 php artisan admin:install变这样了

@萧瑟秋风 兄die~评论里面有答案~~~

@萧瑟秋风 嗯，字符集的问题，laravel 5.4 改变了默认的数据库字符集。好像mysql5.6以上就没有这个问题了