chore: add lazyLoad

Author: Simon he

src/lazyLoad.ts

@@ -1,26 +1,24 @@
-import { isArray } from "./isArray";
-import { isStr } from "./isStr";
-export function lazyLoad(imgList: any, root: Element, rootMargin: string = '0px 0px 200px 0px', threshold: any): void {
+import { isArray } from './isArray'
+import { isStr } from './isStr'
+export function lazyLoad(imgList: any, root: Element, rootMargin = '0px 0px 200px 0px', threshold: any): void {
   if (isStr(imgList))
-    imgList = document.querySelectorAll(imgList);
+    imgList = document.querySelectorAll(imgList)
   if (imgList.length !== undefined)
     imgList = [...imgList]
   const observer = new IntersectionObserver(
     (entries, observer) => {
-      entries.forEach(entry => {
+      entries.forEach((entry) => {
         /* 替换属性 */
         console.log(entry.isIntersecting)
         if (entry.isIntersecting) {
-          (entry.target as HTMLImageElement).src = (entry.target as any).dataset.src;
-          observer.unobserve(entry.target);
+          (entry.target as HTMLImageElement).src = (entry.target as any).dataset.src
+          observer.unobserve(entry.target)
         }
-      });
+      })
     },
-    { rootMargin, root, threshold });
+    { rootMargin, root, threshold })
   if (isArray(imgList))
-    (imgList as Element[]).forEach(img => observer.observe(img));
-  else observer.observe(imgList as Element);
+    (imgList as Element[]).forEach(img => observer.observe(img))
+  else observer.observe(imgList as Element)
 }
 
-
-