�は、引数で指定されたDisplayObjectの重なり順のインデックスを返すメソッドです。"><meta name="twitter:image" content="https://next2d.app/assets/img/ogp.png"><link href="../../../assets/img/favicon.png" rel="icon"><link href="../../../assets/img/apple-touch-icon.png" rel="apple-touch-icon"><link href="../../../assets/vendor/aos/aos.css" rel="stylesheet"><link href="../../../assets/vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet"><link href="../../../assets/vendor/bootstr