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This time I will bring you the principle and implementation of jquery's lazy loading. What are the things to note when implementing jquery's lazy loading? The following is a practical case, let's take a look.
The principle of lazy loading1. Code implementation, load into the current viewport:function isVisible($node){ var winH = $(window).height(), scrollTop = $(window).scrollTop(), offSetTop = $(window).offSet().top; if (offSetTop < winH + scrollTop) { return true; } else { return false; } }2. Then add the browser's
eventlistening Function, let the browser check whether the element appears within the visible range of the window every time it scrolls:
$(window).on("scroll", function{ if (isVisible($node)){ console.log(true); } })3. Come on, Pikachu!
var hasShowed = false; $(window).on("sroll",function{ if (hasShowed) { return; } else { if (isVisible($node)) { hasShowed = !hasShowed; console.log(true); //ajax请求刷新view层 } } })I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to the php Chinese website
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