Observer & MutationObserver & IntersectionObserver & Proxy & Object.defineProperty()

Observer & MutationObserver & IntersectionObserver & Proxy & Object.defineProperty()

https://github.com/xgqfrms/learn-javascript-with-mdn/issues/4

IntersectionObserver

https://juejin.im/post/5d665133e51d4561c83e7c83

懒加载、吸顶、触底

https://github.com/w3c/IntersectionObserver/tree/master/polyfill

https://developers.google.com/web/updates/2016/04/intersectionobserver

getBoundingClientRect

https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect

css sticky

https://developer.mozilla.org/zh-CN/docs/Web/CSS/position

https://codepen.io/xgqfrms/pen/dyogwLB

refs

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