需求

手封侧边栏/电梯组件：实现楼层配置 + 双向联动 最后一格是回到顶部 滚动页面时，对应楼层高亮 点击楼层，页面自动滚动到该楼层，使之顶格显示 传入一个类似以下的参数配置,生成一个电梯组件

      new Elevator([
        { name: "楼层1", domSelector: "#floor1", targetEls: "#point1" },
        { name: "楼层2", domSelector: "#floor2", targetEls: "#point2" },
        { name: "楼层3", domSelector: "#floor3", targetEls: "#point3" },
        { name: "返回顶部", targetEls: "#top" }
      ]);