说明

根据IntersectionObserver实现图片懒加载的封装

提示

• 主要针对长列表形式的图片懒加载，img元素需用数组传递；
• img原图片地址取自dom上data-src属性；
• 支持选择是否启用懒加载

使用

1、视口+不懒加载

const imgs = document.getElementsByTagName("img");
let options = {};
let newImage = new ImgLoad([...imgs], options, (flag) => {
	console.log("成功了", flag);
});
newImage.lazyLoad();

2、视口+懒加载

const imgs = document.getElementsByTagName("img");
let options = { lazy: true };
let newImage = new ImgLoad([...imgs], options, (flag) => {
	console.log("成功了", flag);
});
newImage.lazyLoad();

3、指定祖先元素+懒加载

const imgs = document.getElementsByTagName("img");
let options = { root: document.querySelector(".box"), lazy: true };
let newImage = new ImgLoad([...imgs], options, (flag) => {
	console.log("成功了", flag);
});
newImage.lazyLoad();

4、视口+懒加载+距离视口100px

const imgs = document.getElementsByTagName("img");
let options = { lazy: true, rootMargin: "100px" };
let newImage = new ImgLoad([...imgs], options, (flag) => {
	console.log("成功了", flag);
});
newImage.lazyLoad();

5、Vue组件中使用

# template：部分代码省略
<img :data-src="require('@/assets/1.jpg')" alt="" />
<img :data-src="require('@/assets/2.jpg')" alt="" />
<img :data-src="require('@/assets/3.jpg')" alt="" />
<img :data-src="require('@/assets/4.jpg')" alt="" />

# js：部分代码省略
this.$nextTick(() => {
		const imgs = document.getElementsByTagName("img");
		let options = { lazy: true, rootMargin: "100px" };
		let newImage = new ImgLoad([...imgs], options, (flag) => {
			console.log("成功了", flag);
		});
		newImage.lazyLoad();
});