 100%;" scrolling="no" title="[Next2D Reference] Chapter 04-3" src="https://codepen.io/next2d/embed/abLYRMz?default-tab=js%2Cresult&editable=true&theme-id=dark" frameborder="no" loading="lazy" allowtransparency="true" allowfullscreen="true">See the Pen <a href="https://codepen.io/next2d/pen/abLYRMz">[Next2D Reference] Chapter 04-3</a> by Next2D (<a href="https://codepen.io/next2d">@next2d</a>) on <a href="https://codepen.io">CodePen</a>.</iframe></p><h3>swapChildrenAt</h3><p>swapChildrenAt関数は、引数