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41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
// +----------------------------------------------------------------------
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// | CRMEB [ CRMEB赋能开发者，助力企业发展 ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2016~2026 https://www.crmeb.com All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed CRMEB并不是自由软件，未经许可不能去掉CRMEB相关版权
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// +----------------------------------------------------------------------
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// | Author: CRMEB Team <admin@crmeb.com>
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// +----------------------------------------------------------------------
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// v-lazy 图片懒加载兼容指令（替代 vue-lazyload，基于 IntersectionObserver）
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const lazyDirective = {
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mounted(el, binding) {
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el.__lazySrc = binding.value;
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el.__lazyIo = new IntersectionObserver(
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(entries) => {
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entries.forEach((entry) => {
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if (entry.isIntersecting) {
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el.src = el.__lazySrc;
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el.__lazyIo && el.__lazyIo.disconnect();
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el.__lazyIo = null;
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}
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});
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},
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{ rootMargin: '300px' },
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);
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el.__lazyIo.observe(el);
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},
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updated(el, binding) {
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if (binding.value !== binding.oldValue) {
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el.__lazySrc = binding.value;
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if (el.src) el.src = binding.value;
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}
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},
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unmounted(el) {
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el.__lazyIo && el.__lazyIo.disconnect();
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el.__lazyIo = null;
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},
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};
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export default lazyDirective;
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