Scroll
表示一个滚动事件。
An event triggered by scrolling.
      
      class Scroll {
  constructor(routerEvent: NavigationEnd, position: [number, number], anchor: string)
  routerEvent: NavigationEnd
  position: [number, number] | null
  anchor: string | null
  toString(): string
}
    构造函数
      
      参数
  | 
属性
| 属性 | 说明 | 
|---|---|
 routerEvent: NavigationEnd | 只读 Declared in constructor. | 
 position: [number, number] | null | 只读 Declared in constructor. | 
 anchor: string | null | 只读 Declared in constructor. | 
方法
      
      参数没有参数。 返回值
  |