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How to load pictures lazily with JavaScript

2025-01-19 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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This article mainly introduces how JavaScript realizes lazy loading of pictures. It has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

Image Lazy Loading

image

getBoundClientRect implementation, monitor scroll events (it is recommended to add throttling to monitor events), images will be deleted from the DOM list composed of img tags after loading, and finally all images need to be unbound after loading.

IntersectionObserver implementation, instantiate an IntersectionObserver and make it observe all img tags

When the img tag enters the visible area, it will execute the callback during instantiation. At the same time, an entries parameter is passed to the callback, which saves some states of all elements observed by the instance, such as the boundary information of each element, the DOM node corresponding to the current element, the rate at which the current element enters the visible area. Whenever an element enters the visible area, the real image is assigned to the current img tag, and its observation is released.

Thank you for reading this article carefully. I hope that the article "How to Realize Lazy Loading of JavaScript" shared by Xiaobian will be helpful to everyone. At the same time, I hope that everyone will support it a lot and pay attention to the industry information channel. More relevant knowledge is waiting for you to learn!

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