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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

IntersectionObserverEntry interface's read-only isIntersecting property is 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.

句法

var isIntersecting = IntersectionObserverEntry.isIntersecting;
					

值

A Boolean value which indicates whether the target element has transitioned into a state of intersection ( true ) or out of a state of intersection ( false ).

范例

In this simple example, an intersection callback is used to update a counter of how many targeted elements are currently intersecting with the intersection root .

function intersectionCallback(entries) {
  entries.forEach(function(entry) {
    if (entry.isIntersecting) {
      intersectingCount += 1;
    } else {
      intersectingCount -= 1;
    }
  });
}
					

To see a more concrete example, take a look at Handling intersection changes in Timing element visibility with the Intersection Observer API .

规范

规范	状态	注释
Intersection Observer The definition of 'IntersectionObserverEntry.isIntersecting' in that specification.	工作草案	初始定义

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
isIntersecting	Chrome 51	Edge 16	Firefox 55 55 不支持 53 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera Yes	Safari 12.1	WebView Android 51	Chrome Android 51	Firefox Android ?	Opera Android ?	Safari iOS ?	Samsung Internet Android 5.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

用户必须明确启用此特征。

用户必须明确启用此特征。

元数据

• 最后修改： Jun 26, 2020

相关话题

1. 交集观测器 API
2. IntersectionObserverEntry
3. 特性

   1. boundingClientRect
   2. intersectionRatio
   3. intersectionRect
   4. isIntersecting
   5. rootBounds
   6. target
   7. time
4. Related pages for Intersection Observer API

   1. IntersectionObserver