问题
I'm trying to use IntersectionObserver in cordova 8.0.0 app which is running on ios 13. When I inspect my app via safari, I see an error on intialization:
ReferenceError: Can't find variable: IntersectionObserver
This would suggest, that IntersectionObserver is not available, and I should use a polyfill. But! I've read many post claiming that IntersectionObserver is nativly supported in iOS safari 12+. And I kinda assume, that cordova would be running nativly available WKWebView, so it should work without polyfill, right?
I've found that I've got IntersectionObserver enabled in my safari experimental features, so maybe there is an option/flag I could use to force enable this feature in my app as well? I'd really like to avoid using polyfill if it's possible..
Thx to any suggestions
回答1:
IntersectionObserver API is supported on iOS safari since 12.2. Yet it was supported via 'experimental feature' and enabled by default. I assume that experimental features are not enabled under cordova by default, so far I haven't found a way to configure it to be enabled.
An option is to use polyfill: https://www.npmjs.com/package/intersection-observer. I tested myself and performance is not good enough, it uses either setTimeout or MutationObserver to observe whole document with all options enabled.
来源：https://stackoverflow.com/questions/59074487/reference-error-cant-find-variable-intersectionobserver