Optimize initial loading speed (LazyLoad).

frontend/components/common/LazyLoadWrapper.tsx

@@ -0,0 +1,35 @@
+"use client";
+
+import { useInView } from "react-intersection-observer";
+import { ReactNode, useEffect, useState } from "react";
+
+interface LazyLoadWrapperProps {
+  children: ReactNode;
+  // 可以设置一个延迟，让组件在进入视口后稍微等一下再渲染，避免滚动过快时频繁渲染
+  // rootMargin 可以让组件在距离视口还有 N 像素时就开始加载
+  options?: {
+    triggerOnce?: boolean;
+    rootMargin?: string;
+  };
+}
+
+export default function LazyLoadWrapper({
+  children,
+  options = { triggerOnce: true, rootMargin: "200px" },
+}: LazyLoadWrapperProps) {
+  const { ref, inView } = useInView(options);
+  const [isLoaded, setIsLoaded] = useState(false);
+
+  useEffect(() => {
+    if (inView && !isLoaded) {
+      setIsLoaded(true);
+    }
+  }, [inView, isLoaded]);
+
+  // 使用一个 div 包裹并附加 ref，同时可以设置最小高度，防止懒加载时页面布局跳动
+  return (
+    <div ref={ref} className="min-h-[200px]">
+      {isLoaded ? children : null}
+    </div>
+  );
+}

frontend/components/common/YouTubePlayer.tsx

@@ -12,48 +12,29 @@ const YouTubePlayer: React.FC<YouTubePlayerProps> = ({
   className = "",
 }) => {
   const [isPlaying, setIsPlaying] = useState<boolean>(false);
-  const [thumbnailLoaded, setThumbnailLoaded] = useState<boolean>(false);
-  const [currentThumbnail, setCurrentThumbnail] = useState<string>("");
-
-  const thumbnailUrl = `https://img.youtube.com/vi/${videoId}/maxresdefault.jpg`;
-  const fallbackUrl = `https://img.youtube.com/vi/${videoId}/hqdefault.jpg`;
+  
+  const localThumbnail = "/inActionThumbnail.webp";
   const embedUrl = `https://www.youtube.com/embed/${videoId}?autoplay=1`;
 
-  useEffect(() => {
-    const img = new Image();
-    img.onload = () => {
-      setCurrentThumbnail(img.src);
-      setThumbnailLoaded(true);
-    };
-    img.onerror = () => {
-      img.src = fallbackUrl;
-    };
-    img.src = thumbnailUrl;
-  }, [videoId, thumbnailUrl, fallbackUrl]);
-
   return (
     <div className={`relative w-full max-w-5xl mx-auto ${className}`}>
       <div className="relative pb-[56.25%]">
         {!isPlaying ? (
           <div className="absolute top-0 left-0 w-full h-full">
-            {currentThumbnail && (
-              <img
-                src={currentThumbnail}
-                alt="Video thumbnail"
-                className="w-full h-full object-cover"
-              />
-            )}
-            {thumbnailLoaded && (
-              <button
-                onClick={() => setIsPlaying(true)}
-                className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 
-                       bg-black bg-opacity-70 hover:bg-opacity-90 rounded-full p-4
-                       transition-all duration-300 ease-in-out z-10"
-                aria-label="Play video"
-              >
-                <Play size={48} className="text-white" />
-              </button>
-            )}
+            <img
+              src={localThumbnail}
+              alt="Video preview"
+              className="w-full h-full object-cover"
+            />
+            <button
+              onClick={() => setIsPlaying(true)}
+              className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 
+                     bg-black bg-opacity-70 hover:bg-opacity-90 rounded-full p-4
+                     transition-all duration-300 ease-in-out z-10"
+              aria-label="Play video"
+            >
+              <Play size={48} className="text-white" />
+            </button>
           </div>
         ) : (
           <iframe