方法一：
class User extends Model {
public $timestamps = false;//关闭自动维护
public static function boot() {
parent::boot();
#只添加created_at不添加updated_at
static::creating(function ($model) {
$model->created_at = $model->freshTimestamp();
//$model->updated_at = $model->freshTimeStamp();
});
}
}
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