默认()在laravel迁移中不起作用

Schema::create('example_table', function (Blueprint $table) {
    $table->integer('status')->default(1);
});

use Illuminate\Support\Facades\DB;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class ExampleMigration extends Migration
{
    public function up()
    {
        DB::statement("ALTER TABLE example_table ALTER COLUMN created_at SET DEFAULT now()");
    }

    public function down()
    {
        DB::statement("ALTER TABLE example_table ALTER COLUMN created_at DROP DEFAULT");
    }
}