commit 79b13fb280f59cae52cad5d22fa261c51f48c37e
Author: Snowz <372492339@qq.com>
Date:   Sat Apr 12 15:38:09 2025 +0800

    feat: 新增App图标搜索器增强版功能
    
    引入完整的App图标搜索器增强版，包括前端页面、后端缓存系统、样式和脚本。主要功能包括实时搜索、多尺寸图标下载、图片预览、响应式设计和智能缓存机制。后端通过ImageCache类实现图片缓存，前端通过JavaScript优化搜索交互和图片加载体验。新增README.md提供详细的部署和开发指南。

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4e925de
--- /dev/null
+++ b/README.md
@@ -0,0 +1,164 @@
+# App图标搜索器增强版
+
+一个高效、现代的 App 图标搜索和下载工具，基于 iTunes Search API 开发。支持多种尺寸图标下载，具有响应式设计和用户友好的界面。
+
+## 功能特点
+
+- 实时搜索：支持即时搜索结果展示
+- 多尺寸下载：支持 75px、100px、256px、512px 尺寸
+- 图片预览：支持图标大图预览
+- 响应式设计：完美适配移动端和桌面端
+- 智能缓存：支持服务端和客户端双重缓存机制
+- 用户友好：简洁的界面设计和流畅的交互体验
+
+## 技术栈
+
+### 前端
+- HTML5 + CSS3
+- 原生 JavaScript (ES6+)
+- CSS Grid 和 Flexbox 布局
+- Service Worker 离线缓存
+
+### 后端
+- PHP 7.4+
+- iTunes Search API
+- 文件系统缓存
+
+### 服务器
+- Apache/Nginx
+- PHP-FPM
+- 图片缓存系统
+
+## 部署指南
+
+### 环境要求
+- PHP >= 7.4
+- Apache/Nginx Web服务器
+- 允许外部API访问
+- PHP GD库（用于图片处理）
+- 足够的磁盘空间用于缓存
+
+### Apache 部署步骤
+
+```
+<VirtualHost *:80>
+    ServerName your-domain.com
+    DocumentRoot /path/to/icons-enhanced
+    
+    <Directory /path/to/icons-enhanced>
+        Options -Indexes +FollowSymLinks
+        AllowOverride All
+        Require all granted
+    </Directory>
+    
+    <FilesMatch "\.(jpg|jpeg|png|gif)$">
+        Header set Cache-Control "max-age=31536000, public"
+    </FilesMatch>
+</VirtualHost>
+```
+
+### Nginx 部署步骤
+
+```
+server {
+    listen 80;
+    server_name your-domain.com;
+    root /path/to/icons-enhanced;
+    index index.php;
+
+    location / {
+        try_files $uri $uri/ /index.php?$query_string;
+    }
+
+    location ~ \.php$ {
+        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
+        fastcgi_index index.php;
+        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+        include fastcgi_params;
+    }
+
+    location ~* \.(jpg|jpeg|png|gif)$ {
+        expires 1y;
+        add_header Cache-Control "public, no-transform";
+        access_log off;
+    }
+}
+```
+### 配置权限
+
+```
+chmod -R 755 .
+chmod -R 777 cache/images
+```
+
+## 自定义开发指南
+### 前端定制
+1. 样式修改
+- 主题颜色：修改 css/styles.css 中的 CSS 变量
+- 布局调整：修改 Grid 和 Flexbox 相关样式
+- 响应式断点：调整 media queries 中的尺寸
+2. 交互优化
+- 搜索逻辑：修改 js/scripts.js 中的防抖函数
+- 动画效果：调整 transition 和 transform 相关属性
+- 预览功能：自定义模态框行为
+### 后端定制
+1. 缓存策略
+- 修改缓存时间：调整 ImageCache.php 中的 cacheDuration
+- 自定义缓存目录：更改 cacheDir 配置
+- 添加缓存清理机制
+2. API 调整
+- 修改搜索参数：调整 iTunes API 请求参数
+- 添加错误处理：完善异常处理机制
+- 扩展搜索源：添加其他图标源支持
+### 性能优化
+1. 图片优化
+- 实现图片懒加载
+- 添加图片压缩功能
+- 使用 WebP 格式支持
+2. 缓存优化
+- 实现浏览器缓存
+- 添加 CDN 支持
+- 优化缓存策略
+## 常见问题
+1. 图片加载失败
+- 检查服务器权限设置
+- 验证缓存目录权限
+- 确认外部API访问是否正常
+2. 搜索响应慢
+- 调整防抖时间
+- 优化数据请求策略
+- 检查服务器性能
+3. 移动端适配问题
+- 检查视口设置
+- 调整响应式断点
+- 优化触摸交互
+## 维护建议
+1. 定期维护
+- 清理过期缓存
+- 更新依赖版本
+- 检查API可用性
+2. 性能监控
+- 监控服务器负载
+- 跟踪API响应时间
+- 分析用户使用数据
+## 贡献指南
+欢迎提交 Pull Request 或 Issue。在提交之前，请确保：
+
+1. 代码符合现有风格
+2. 添加必要的注释和文档
+3. 测试所有功能正常
+## 许可证
+MIT License - 详见根目录 LICENSE 文件
+
+## 作者
+[Snowz]
+
+## 更新日志
+### v1.0.0 (2025-03-31)
+- 初始版本发布
+- 基础搜索功能
+- 多尺寸下载支持
+### v1.1.0 (计划中)
+- 添加图片懒加载
+- 优化搜索体验
+- 改进缓存机制
\ No newline at end of file
diff --git a/cache/ImageCache.php b/cache/ImageCache.php
new file mode 100644
index 0000000..b8312a2
--- /dev/null
+++ b/cache/ImageCache.php
@@ -0,0 +1,32 @@
+<?php
+class ImageCache {
+    private $cacheDir;
+    private $cacheDuration = 604800; // 7天缓存
+
+    public function __construct() {
+        $this->cacheDir = __DIR__ . '/images/';
+        if (!file_exists($this->cacheDir)) {
+            mkdir($this->cacheDir, 0777, true);
+        }
+    }
+
+    public function getCachedImage($url) {
+        $cacheFile = $this->cacheDir . md5($url);
+        
+        if (file_exists($cacheFile) && (time() - filemtime($cacheFile) < $this->cacheDuration)) {
+            return file_get_contents($cacheFile);
+        }
+
+        $imageContent = file_get_contents($url);
+        if ($imageContent !== false) {
+            file_put_contents($cacheFile, $imageContent);
+            return $imageContent;
+        }
+        
+        return false;
+    }
+
+    public function getCacheUrl($url) {
+        return 'cache/image.php?url=' . urlencode($url);
+    }
+}
\ No newline at end of file
diff --git a/cache/image.php b/cache/image.php
new file mode 100644
index 0000000..17c94d5
--- /dev/null
+++ b/cache/image.php
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+<?php
+require_once 'ImageCache.php';
+
+$url = isset($_GET['url']) ? $_GET['url'] : '';
+if (empty($url)) {
+    header("HTTP/1.0 404 Not Found");
+    exit;
+}
+
+$imageCache = new ImageCache();
+$image = $imageCache->getCachedImage($url);
+
+if ($image === false) {
+    header("HTTP/1.0 404 Not Found");
+    exit;
+}
+
+$extension = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION);
+switch(strtolower($extension)) {
+    case 'jpg':
+    case 'jpeg':
+        header('Content-Type: image/jpeg');
+        break;
+    case 'png':
+        header('Content-Type: image/png');
+        break;
+    case 'gif':
+        header('Content-Type: image/gif');
+        break;
+    default:
+        header('Content-Type: image/jpeg');
+}
+
+header('Cache-Control: public, max-age=31536000');
+header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
+
+echo $image;
\ No newline at end of file
diff --git a/css/styles.css b/css/styles.css
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--- /dev/null
+++ b/css/styles.css
@@ -0,0 +1,317 @@
+:root {
+    --primary-color: #4a90e2;
+    --secondary-color: #2c3e50;
+    --background-color: #f5f6fa;
+    --card-background: #ffffff;
+    --text-color: #2c3e50;
+    --border-radius: 12px;
+    --transition: all 0.3s ease;
+    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
+    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
+    --shadow-lg: 0 8px 15px rgba(0, 0, 0, 0.1);
+}
+
+/* 基础样式 */
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+    background-color: var(--background-color);
+    color: var(--text-color);
+    line-height: 1.6;
+}
+
+/* 布局容器 */
+.container {
+    max-width: 1200px;
+    margin: 0 auto;
+    padding: 2rem;
+}
+
+/* 搜索区域 */
+.search-container {
+    text-align: center;
+    margin-bottom: 3rem;
+    width: 100%;
+}
+
+h1 {
+    font-size: 2.5rem;
+    color: var(--primary-color);
+    margin-bottom: 1.5rem;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    gap: 0.5rem;
+}
+
+/* 搜索区域 */
+.search-box {
+    display: flex;
+    max-width: 600px;
+    margin: 0 auto 1rem;
+    position: relative;
+}
+
+input[type="text"] {
+    flex: 1;
+    padding: 0.8rem 1rem;
+    font-size: 1.1rem;
+    border: 2px solid #e1e1e1;
+    border-radius: var(--border-radius) 0 0 var(--border-radius);
+    transition: var(--transition);
+    outline: none;
+}
+
+input[type="text"]:focus {
+    border-color: var(--primary-color);
+    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
+}
+
+button[type="submit"] {
+    padding: 0.8rem 1.5rem;
+    background-color: var(--primary-color);
+    color: white;
+    border: none;
+    border-radius: 0 var(--border-radius) var(--border-radius) 0;
+    cursor: pointer;
+    transition: var(--transition);
+    min-width: 60px;
+}
+
+button[type="submit"]:hover {
+    background-color: #357abd;
+}
+
+button[type="submit"]:active {
+    transform: translateY(1px);
+}
+
+.search-options {
+    margin-top: 1rem;
+    display: flex;
+    justify-content: center;
+}
+
+select {
+    padding: 0.5rem;
+    border-radius: var(--border-radius);
+    border: 2px solid #e1e1e1;
+    background-color: white;
+    cursor: pointer;
+}
+
+/* 图标卡片 */
+.icon-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
+    gap: 2rem;
+    margin-top: 2rem;
+}
+
+.icon-card {
+    background: var(--card-background);
+    border-radius: 16px;
+    padding: 1.5rem;
+    box-shadow: var(--shadow-md);
+    transition: var(--transition);
+    text-align: center;
+    display: flex;
+    flex-direction: column;
+    gap: 1rem;
+}
+
+.icon-card:hover {
+    transform: translateY(-5px);
+    box-shadow: var(--shadow-lg);
+}
+
+/* 图标图片 */
+.icon-image {
+    text-align: center;
+    margin-bottom: 1rem;
+}
+
+.icon-image img {
+    width: 100px;
+    height: 100px;
+    border-radius: 22px;
+    cursor: pointer;
+    transition: transform 0.3s ease;
+}
+
+.icon-image img:hover {
+    transform: scale(1.05);
+}
+
+/* 应用名称 */
+.app-name {
+    font-size: 1.1rem;
+    margin: 0.5rem 0;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    color: var(--text-color);
+}
+
+/* 下载按钮 */
+.download-options {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    margin-top: 12px;
+    width: 100%;
+    padding: 0 2px;
+}
+
+.download-options-row {
+    display: flex;
+    gap: 6px;
+    width: 100%;
+}
+
+.size-btn {
+    background-color: var(--primary-color);
+    color: white;
+    text-decoration: none;
+    border-radius: 10px;
+    font-size: 0.85rem;
+    text-align: center;
+    transition: var(--transition);
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    flex: 1;
+    border: none;
+    box-shadow: var(--shadow-sm);
+}
+
+.size-btn:hover {
+    background-color: #357abd;
+    transform: translateY(-2px);
+    box-shadow: var(--shadow-md);
+}
+
+.size-btn:active {
+    transform: translateY(0);
+}
+
+.size-btn-small {
+    padding: 8px 0;
+    min-height: 65px;
+    max-width: calc(33.33% - 4px);
+}
+
+.size-btn-large {
+    padding: 8px 0;
+    min-height: 45px;
+}
+
+/* 模态框 */
+.modal {
+    display: none;
+    position: fixed;
+    z-index: 1000;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background-color: rgba(0, 0, 0, 0.9);
+}
+
+/* 返回顶部按钮 */
+#back-to-top {
+    position: fixed;
+    bottom: 20px;
+    right: 20px;
+    display: none;
+    padding: 1rem;
+    border-radius: 50%;
+    background-color: var(--primary-color);
+    color: white;
+    border: none;
+    cursor: pointer;
+    transition: var(--transition);
+}
+
+/* 响应式设计 */
+@media (max-width: 768px) {
+    .container {
+        padding: 1rem;
+    }
+    
+    h1 {
+        font-size: 2rem;
+    }
+    
+    .icon-grid {
+        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+        gap: 1rem;
+    }
+    
+    .icon-card {
+        padding: 1.2rem;
+        gap: 0.8rem;
+    }
+    
+    .size-btn-small {
+        min-height: 50px;
+        padding: 6px 0;
+    }
+    
+    .size-btn-large {
+        min-height: 38px;
+        padding: 6px 0;
+    }
+    
+    .size-label {
+        font-size: 0.85rem;
+    }
+    
+    .size-desc {
+        font-size: 0.65rem;
+    }
+}
+
+/* 页脚样式 */
+footer {
+    background-color: var(--secondary-color);
+    color: white;
+    padding: 2rem 0;
+    margin-top: 3rem;
+    width: 100%;
+}
+
+.footer-content {
+    max-width: 1200px;
+    margin: 0 auto;
+    text-align: center;
+    padding: 0 1rem;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 1rem;
+}
+
+.social-links {
+    display: flex;
+    justify-content: center;
+    gap: 1rem;
+}
+
+.social-links a {
+    color: white;
+    font-size: 1.5rem;
+    text-decoration: none;
+    transition: var(--transition);
+    padding: 0.5rem;
+}
+
+.social-links a:hover {
+    color: var(--primary-color);
+}
\ No newline at end of file
diff --git a/index.php b/index.php
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--- /dev/null
+++ b/index.php
@@ -0,0 +1,119 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>App图标搜索器 - 增强版</title>
+    <meta name="description" content="一款可以在线搜索APP图标并下载小工具">
+    <meta name="keywords" content="photo8,App图标搜索器">
+    <link rel="shortcut icon" href="https://api.photo8.site/path/img/icon-64@3x.png" type="image/png">
+    <link rel="stylesheet" href="css/styles.css">
+    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" rel="stylesheet">
+</head>
+<body>
+    <div class="container">
+        <div class="search-container">
+            <h1><i class="fas fa-search"></i> App图标搜索器</h1>
+            <form method="GET" action="" id="searchForm">
+                <div class="search-box">
+                    <input type="text" name="term" id="searchInput" placeholder="输入APP名字..." value="<?php echo htmlspecialchars($searchTerm ?? ''); ?>">
+                    <button type="submit"><i class="fas fa-search"></i></button>
+                </div>
+                <div class="search-options">
+                    <select name="limit" id="limitSelect">
+                        <option value="20">20个结果</option>
+                        <option value="50">50个结果</option>
+                        <option value="100">100个结果</option>
+                    </select>
+                </div>
+            </form>
+        </div>
+
+        <div class="icon-grid" id="iconGrid">
+            <?php
+            function fetchAppData($term, $limit, $offset) {
+                $url = "https://itunes.apple.com/search?term=" . urlencode($term) . "&country=CN&entity=software&limit=" . $limit . "&offset=" . $offset;
+                $json = @file_get_contents($url);
+                if ($json === false) {
+                    return [];
+                }
+                $data = json_decode($json, true);
+                return $data['results'] ?? [];
+            }
+
+            $searchTerm = isset($_GET['term']) ? trim($_GET['term']) : '';
+            $limit = isset($_GET['limit']) ? (int)$_GET['limit'] : 20;
+
+            if ($searchTerm) {
+                $apps = fetchAppData($searchTerm, $limit, 0);
+                if (!empty($apps)) {
+                    foreach ($apps as $app) {
+                        $iconSizes = [
+                            ['size' => '75x75bb', 'label' => '75px', 'desc' => '小图'],
+                            ['size' => '100x100bb', 'label' => '100px', 'desc' => '标准'],
+                            ['size' => '256x256bb', 'label' => '256px', 'desc' => '高清'],
+                            ['size' => '512x512bb', 'label' => '512px', 'desc' => '超清']
+                        ];
+                        
+                        echo '<div class="icon-card">';
+                        require_once 'cache/ImageCache.php';
+                        $imageCache = new ImageCache();
+                        
+                        // 启用图片缓存
+                        echo '<div class="icon-image">';
+                        $cachedImageUrl = $imageCache->getCacheUrl($app['artworkUrl100']);
+                        echo '<img src="' . htmlspecialchars($cachedImageUrl) . '" alt="' . htmlspecialchars($app['trackName']) . '" 
+                              data-high-res="' . str_replace('100x100bb', '512x512bb', $cachedImageUrl) . '">';
+                        echo '</div>';
+                        echo '<h3 class="app-name">' . htmlspecialchars($app['trackName']) . '</h3>';
+                        echo '<div class="download-options">';
+                        echo '<div class="download-options-row">';
+                        // 前三个按钮 (75px, 100px, 256px)
+                        foreach (array_slice($iconSizes, 0, 3) as $size) {
+                            $sizeUrl = str_replace('100x100bb', $size['size'], $app['artworkUrl100']);
+                            echo '<a href="' . htmlspecialchars($sizeUrl) . '" class="size-btn size-btn-small" target="_blank">';
+                            echo '<span class="size-label">' . $size['label'] . '</span>';
+                            echo '<span class="size-desc">' . $size['desc'] . '</span>';
+                            echo '</a>';
+                        }
+                        echo '</div>';
+                        // 最后一个按钮 (512px)
+                        $lastSize = end($iconSizes);
+                        $lastSizeUrl = str_replace('100x100bb', $lastSize['size'], $app['artworkUrl100']);
+                        echo '<a href="' . htmlspecialchars($lastSizeUrl) . '" class="size-btn size-btn-large" target="_blank">';
+                        echo '<span class="size-label">' . $lastSize['label'] . '</span>';
+                        echo '<span class="size-desc">' . $lastSize['desc'] . '</span>';
+                        echo '</a>';
+                        echo '</div>';
+                        echo '</div>';
+                    }
+                } else {
+                    echo '<div class="no-results"><i class="fas fa-exclamation-circle"></i><p>没有找到相关应用</p></div>';
+                }
+            }
+            ?>
+        </div>
+    </div>
+
+    <div id="imagePreview" class="modal">
+        <span class="close">&times;</span>
+        <img class="modal-content" id="previewImage">
+        <div id="imageCaption"></div>
+    </div>
+
+    <?php if ($searchTerm): ?>
+    <footer>
+        <div class="footer-content">
+            <p>© 2024 PHOTO8 - App图标搜索器</p>
+            <div class="social-links">
+                <a href="#" title="微博"><i class="fab fa-weibo"></i></a>
+                <a href="#" title="微信"><i class="fab fa-weixin"></i></a>
+            </div>
+        </div>
+    </footer>
+    <?php endif; ?>
+
+    <button id="back-to-top" title="返回顶部"><i class="fas fa-arrow-up"></i></button>
+    <script src="js/scripts.js"></script>
+</body>
+</html>
\ No newline at end of file
diff --git a/js/scripts.js b/js/scripts.js
new file mode 100644
index 0000000..294ca69
--- /dev/null
+++ b/js/scripts.js
@@ -0,0 +1,105 @@
+document.addEventListener('DOMContentLoaded', function() {
+    const backToTop = document.getElementById('back-to-top');
+    const modal = document.getElementById('imagePreview');
+    const modalImg = document.getElementById('previewImage');
+    const closeBtn = document.getElementsByClassName('close')[0];
+    const searchInput = document.getElementById('searchInput');
+    const iconGrid = document.getElementById('iconGrid');
+
+    // 返回顶部按钮
+    window.onscroll = function() {
+        if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
+            backToTop.style.display = 'block';
+        } else {
+            backToTop.style.display = 'none';
+        }
+    };
+
+    backToTop.onclick = function() {
+        window.scrollTo({
+            top: 0,
+            behavior: 'smooth'
+        });
+    };
+
+    // 图标预览模态框
+    document.querySelectorAll('.icon-image img').forEach(img => {
+        img.onclick = function() {
+            modal.style.display = 'block';
+            modalImg.src = this.getAttribute('data-high-res');
+            modalImg.alt = this.alt;
+        };
+    });
+
+    closeBtn.onclick = function() {
+        modal.style.display = 'none';
+    };
+
+    window.onclick = function(event) {
+        if (event.target == modal) {
+            modal.style.display = 'none';
+        }
+    };
+
+    // 搜索输入优化
+    // 搜索防抖功能
+    function debounce(func, wait) {
+        let timeout;
+        return function (...args) {
+            clearTimeout(timeout);
+            timeout = setTimeout(() => func.apply(this, args), wait);
+        };
+    }
+
+    document.addEventListener('DOMContentLoaded', function() {
+        const searchForm = document.getElementById('searchForm');
+        const searchInput = document.getElementById('searchInput');
+        
+        // 防止表单自动提交
+        searchForm.addEventListener('submit', function(e) {
+            e.preventDefault();
+            if (searchInput.value.trim()) {
+                this.submit();
+            }
+        });
+    
+        // 输入防抖
+        const debouncedSearch = debounce(function(value) {
+            if (value.trim().length >= 2) {
+                searchForm.submit();
+            }
+        }, 800);
+    
+        // 监听输入事件
+        searchInput.addEventListener('input', function(e) {
+            const value = e.target.value;
+            debouncedSearch(value);
+        });
+    
+        // 添加加载状态
+        searchForm.addEventListener('submit', function() {
+            const button = this.querySelector('button[type="submit"]');
+            button.innerHTML = '<i class="fas fa-spinner fa-spin"></i>';
+            button.disabled = true;
+            
+            // 2秒后恢复按钮状态（如果请求完成会被新页面覆盖）
+            setTimeout(() => {
+                button.innerHTML = '<i class="fas fa-search"></i>';
+                button.disabled = false;
+            }, 2000);
+        });
+    });
+
+    // 图标加载动画
+    const observer = new IntersectionObserver((entries) => {
+        entries.forEach(entry => {
+            if (entry.isIntersecting) {
+                entry.target.classList.add('fade-in');
+            }
+        });
+    });
+
+    document.querySelectorAll('.icon-card').forEach(card => {
+        observer.observe(card);
+    });
+});
\ No newline at end of file