Laravel中多对多关系模型对口才模型的排序

class Skill extends Model
{
    public function persons()
    {
        return $this->belongsToMany(Person::class)
                    ->withPivot('order')
                    ->orderBy('order');
    }
}

class Person extends Model
{
    public function skills()
    {
        return $this->belongsToMany(Skill::class)
                    ->withPivot('order')
                    ->orderBy('order');
    }
}

Schema::create('person_skill', function (Blueprint $table) {
    $table->unsignedBigInteger('person_id');
    $table->unsignedBigInteger('skill_id');
    $table->integer('order')->default(0);
    
    $table->foreign('person_id')->references('id')->on('persons');
    $table->foreign('skill_id')->references('id')->on('skills');
});

$person = Person::find(1);
$skills = $person->skills;