Created
December 5, 2017 01:53
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单个图片懒加载
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| /* | |
| Lazy Loading Images | |
| https://css-tricks.com/snippets/javascript/lazy-loading-images/ | |
| */ | |
| function loadImage (el, fn) { | |
| var img = new Image() | |
| , src = el.getAttribute('data-src'); | |
| img.onload = function() { | |
| if (!! el.parent) | |
| el.parent.replaceChild(img, el) | |
| else | |
| el.src = src; | |
| fn? fn() : null; | |
| } | |
| img.src = src; | |
| } | |
| // <img class="avatar" src="data:image/png; base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" | |
| // data-src="https://i.stack.imgur.com/dtwVN.png?s=48&g=1" alt="头像"> | |
| var avatar = document.querySelector('.avatar'); | |
| loadImage(avatar); |
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