IntersectionObserver.thresholds
Experimental: 这是一个实验中的功能
此功能某些浏览器尚在开发中,请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订,所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
The IntersectionObserver
interface's read-only thresholds
property returns the list of intersection thresholds that was specified when the observer was instantiated with IntersectionObserver()
. If only one threshold ratio was provided when instanitating the object, this will be an array containing that single value.
See Intersection Observer to learn how thresholds work.
Syntax
var thresholds = IntersectionObserver.thresholds;
Value
An array of intersection thresholds, originally specified using the threshold
property when instantiating the observer. If only one observer was specified, without being in an array, this value is a one-entry array containing that threshold. Regardless of the order your original threshold
array was in, this one is always sorted in numerically increasing order.
If no threshold
option was included when IntersectionObserver()
was used to instantiate the observer, the value of thresholds
is simply [0]
.
备注: Be careful! Although the options
object you can specify when creating an IntersectionObserver
has a field named threshold
, this property is called thresholds
. Confusing? Yes. If you accidentally use thresholds
as the name of the field in your options
, the thresholds
array will wind up being simply [0.0]
, which is likely not what you expect. Debugging chaos may ensue.
Examples
<<<...>>>
Specifications
Specification |
---|
Intersection Observer # dom-intersectionobserver-thresholds |
Browser compatibility
BCD tables only load in the browser