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IntersectionObserverEntry - Web APIs 编辑

The IntersectionObserverEntry interface of the Intersection Observer API describes the intersection between the target element and its root container at a specific moment of transition. Instances of IntersectionObserverEntry are delivered to an IntersectionObserver callback in its entries parameter; otherwise, these objects can only be obtained by calling IntersectionObserver.takeRecords().

Properties

IntersectionObserverEntry.boundingClientRect Read only: Returns the bounds rectangle of the target element as a DOMRectReadOnly. The bounds are computed as described in the documentation for Element.getBoundingClientRect().
IntersectionObserverEntry.intersectionRatio Read only: Returns the ratio of the intersectionRect to the boundingClientRect.
IntersectionObserverEntry.intersectionRect Read only: Returns a DOMRectReadOnly representing the target's visible area.
IntersectionObserverEntry.isIntersecting Read only: A Boolean value which is true if the target element intersects with the intersection observer's root. If this is true, then, the IntersectionObserverEntry describes a transition into a state of intersection; if it's false, then you know the transition is from intersecting to not-intersecting.
IntersectionObserverEntry.rootBounds Read only: Returns a DOMRectReadOnly for the intersection observer's root.
IntersectionObserverEntry.target Read only: The Element whose intersection with the root changed.
IntersectionObserverEntry.time Read only: A DOMHighResTimeStamp indicating the time at which the intersection was recorded, relative to the IntersectionObserver's time origin.