The "load" event can only be caught by the window, document, or elements that involve some kind of external resource (like "img'). A "div" element doesn't qualify to get a "load" event. I can't seem to find this in MDN (my normal go-to reference), but here's a list of ele...
This can be achieved through the removeEventListener: document.removeEventListener("scroll", Wake_Up_Image); Combining all of the above changes and optimizations, the overall code becomes: var lazyImages = document.querySelectorAll("img.lazy"); var lazyloadTimeout; function Wake_Up_Image()...
Notice themedia="print"on the font stylesheet link. Browsers automatically give print stylesheets a low priority and exclude them as a part of the critical render path. After the print stylesheet has been loaded, anonloadevent is fired, the media is switched to a defaultallvalue, and the fon...
Next and final step: since lazy loading is a one-time action and we do not need to download the image every time the element gets into our “capturing frame,” we shouldunobservethe already-processed image. The same way as we should do it withelement.removeEventListener()for our regular ...
The bubbling phase:the event is dispatched to the target's ancestors from the direct parent of the target node to the root of the tree. useCaptureindicates for which phases the event travel will be on: Iftrue, useCapture indicates that the user wishes to add the event listener for the capt...
该API 的详细文档可参照MDN - Element.clientHeight。 1.3.2 Element.getBoundingClientRect() Element.getBoundingClientRect()方法返回一个DOMRect对象,其提供了元素的大小及其相对于视口的位置。 该方法无参数,返回值为DOMRect对象,该对象的属性以下几个: width:就是元素自身宽度 height: 元素自身高度 left(x):元...