Laravel 5.1:如何在不使用视图的情况下传递HTML正文和文本正文？

php artisan make:mail MyEmail

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;

class MyEmail extends Mailable
{
    use Queueable, SerializesModels;

    public $htmlContent;
    public $textContent;

    public function __construct($htmlContent, $textContent)
    {
        $this->htmlContent = $htmlContent;
        $this->textContent = $textContent;
    }

    public function build()
    {
        return $this->view('emails.blank')
                    ->with([
                        'htmlContent' => $this->htmlContent,
                        'textContent' => $this->textContent
                    ])
                    ->text('emails.blank_text');
    }
}

use App\Mail\MyEmail;
use Illuminate\Support\Facades\Mail;

public function sendEmail()
{
    $htmlContent = '<h1>Hello</h1><p>This is the HTML content of the email.</p>';
    $textContent = 'Hello, This is the text content of the email.';
    
    Mail::to('example@example.com')->send(new MyEmail($htmlContent, $textContent));
}