• Element.append()の活用　-> Element.append()：文字列も複数要素もOK！
• -> spotの閉じるボタンの位置がおかしい！
• ->
• ->

---

---

---

btn = [];
for(const key in op) {
  if(!['nav','header','main','footer','json','box','inner','ori','debug'].includes(key)) {
    $this[key] = (isNode(op[key]))?op[key]:el$(op[key]);
    btn.push($this[key]);
  }
}
const $style = (op.debug)?'width:100%;':'display:none!important;';
$this.nav = el$($x$({tag:'nav'},op.nav),...btn);