我要开发一个h5的项目。 目标平台是PC浏览器和手机浏览器。 分为前端和后端。 后端采用python 不需要数据库，直接用文件系统，启动的时候读取到内存就可以。
功能 1、是前端能从后端拉起一组图片，分类为“男”，“女”。 这个图片是保存到oss文件系统的，后端需要提供图片的url。 2、前端可以选择一个图片，手动端可以拍摄图片或者选择图片。 3、前端发起更换发型的请求，把选择的图片和对应要更换的发型ID发给后端。 4、前端收到后端更换发型的请求后处理图片返回给前端。 5、后端实际处理更换发型请求的时候会调用另外一个远程的http接口来实现。 先帮我把项目结构，产品文档，系统框架等做出来。
This commit is contained in:
@@ -0,0 +1,408 @@
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/* 全局样式 */
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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body {
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
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background-color: #f5f5f5;
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color: #333;
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line-height: 1.6;
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}
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/* 应用容器 */
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#app {
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max-width: 1200px;
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margin: 0 auto;
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min-height: 100vh;
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background-color: white;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
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}
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/* 导航栏 */
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.navbar {
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display: flex;
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align-items: center;
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justify-content: space-between;
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padding: 1rem 2rem;
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background-color: #4A90E2;
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color: white;
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position: sticky;
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top: 0;
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z-index: 100;
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}
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.navbar h1 {
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font-size: 1.5rem;
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font-weight: 600;
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}
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.back-btn {
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background: none;
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border: none;
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color: white;
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font-size: 1rem;
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cursor: pointer;
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padding: 0.5rem;
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border-radius: 4px;
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transition: background-color 0.3s;
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}
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.back-btn:hover {
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background-color: rgba(255, 255, 255, 0.2);
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}
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/* 主内容区 */
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.main-content {
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padding: 2rem;
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min-height: calc(100vh - 70px);
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}
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/* 页面切换 */
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.page {
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display: none;
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}
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.page.active {
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display: block;
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}
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/* 图片上传区 */
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.upload-area {
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margin-bottom: 3rem;
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}
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.image-preview {
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width: 100%;
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max-width: 400px;
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height: 400px;
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margin: 0 auto;
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border: 2px dashed #ddd;
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border-radius: 8px;
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overflow: hidden;
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position: relative;
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display: flex;
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align-items: center;
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justify-content: center;
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background-color: #fafafa;
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}
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.upload-placeholder {
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text-align: center;
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cursor: pointer;
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padding: 2rem;
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}
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.upload-icon {
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font-size: 4rem;
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margin-bottom: 1rem;
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}
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.upload-placeholder p {
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color: #999;
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margin-bottom: 1rem;
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}
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#imageUpload {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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opacity: 0;
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cursor: pointer;
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}
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.image-preview img {
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width: 100%;
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height: 100%;
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object-fit: cover;
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}
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/* 发型分类入口 */
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.category-section {
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text-align: center;
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}
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.category-section h2 {
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margin-bottom: 2rem;
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color: #333;
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}
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.category-buttons {
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display: flex;
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justify-content: center;
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gap: 2rem;
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flex-wrap: wrap;
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}
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.category-btn {
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display: flex;
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flex-direction: column;
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align-items: center;
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padding: 2rem;
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border: 2px solid #4A90E2;
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border-radius: 12px;
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background-color: white;
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cursor: pointer;
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transition: all 0.3s;
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min-width: 150px;
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}
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.category-btn:hover {
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background-color: #4A90E2;
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color: white;
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transform: translateY(-5px);
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box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
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}
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.gender-icon {
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font-size: 3rem;
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margin-bottom: 1rem;
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}
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/* 分类导航 */
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.category-nav {
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display: flex;
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margin-bottom: 2rem;
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border-bottom: 2px solid #eee;
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}
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.nav-category-btn {
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flex: 1;
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padding: 1rem;
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background: none;
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border: none;
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font-size: 1rem;
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cursor: pointer;
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transition: all 0.3s;
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border-bottom: 3px solid transparent;
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}
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.nav-category-btn.active {
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border-bottom-color: #4A90E2;
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color: #4A90E2;
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font-weight: 600;
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}
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/* 发型列表 */
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.hairstyle-list h2 {
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margin-bottom: 2rem;
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color: #333;
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}
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.hairstyle-grid {
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display: grid;
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grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
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gap: 1.5rem;
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margin-bottom: 3rem;
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}
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.hairstyle-item {
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border: 2px solid #eee;
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border-radius: 8px;
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overflow: hidden;
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cursor: pointer;
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transition: all 0.3s;
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}
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.hairstyle-item:hover {
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border-color: #4A90E2;
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transform: translateY(-5px);
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box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
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}
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.hairstyle-item.selected {
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border-color: #4A90E2;
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box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
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}
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.hairstyle-item img {
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width: 100%;
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height: 150px;
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object-fit: cover;
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}
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.hairstyle-item p {
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padding: 0.5rem;
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text-align: center;
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font-size: 0.9rem;
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}
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/* 确认按钮 */
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.confirm-section {
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margin-top: 3rem;
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text-align: center;
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}
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.confirm-btn {
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padding: 1rem 3rem;
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background-color: #50E3C2;
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color: white;
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border: none;
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border-radius: 8px;
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font-size: 1.1rem;
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font-weight: 600;
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cursor: pointer;
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transition: all 0.3s;
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}
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.confirm-btn:hover:not(:disabled) {
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background-color: #38D1B0;
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transform: translateY(-2px);
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box-shadow: 0 4px 12px rgba(80, 227, 194, 0.3);
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}
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.confirm-btn:disabled {
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background-color: #ccc;
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cursor: not-allowed;
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}
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/* 结果预览 */
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.result-section {
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margin-bottom: 3rem;
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}
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.result-section h2 {
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margin-bottom: 2rem;
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color: #333;
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}
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.result-preview {
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width: 100%;
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max-width: 500px;
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height: 500px;
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margin: 0 auto;
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border: 2px solid #eee;
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border-radius: 8px;
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overflow: hidden;
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background-color: #fafafa;
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display: flex;
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align-items: center;
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justify-content: center;
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}
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.result-preview img {
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width: 100%;
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height: 100%;
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object-fit: cover;
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}
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/* 操作按钮 */
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.action-buttons {
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display: flex;
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flex-direction: column;
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gap: 1rem;
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max-width: 400px;
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margin: 0 auto;
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}
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.action-btn {
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display: flex;
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align-items: center;
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justify-content: center;
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padding: 1rem;
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border: 2px solid #4A90E2;
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border-radius: 8px;
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background-color: white;
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color: #4A90E2;
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cursor: pointer;
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transition: all 0.3s;
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}
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.action-btn:hover {
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background-color: #4A90E2;
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color: white;
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}
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.action-icon {
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font-size: 1.2rem;
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margin-right: 0.5rem;
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}
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/* 加载指示器 */
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.loading {
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position: fixed;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background-color: rgba(255, 255, 255, 0.9);
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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z-index: 1000;
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}
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.loading-spinner {
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width: 50px;
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height: 50px;
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border: 5px solid #f3f3f3;
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border-top: 5px solid #4A90E2;
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border-radius: 50%;
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animation: spin 1s linear infinite;
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margin-bottom: 1rem;
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}
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@keyframes spin {
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0% { transform: rotate(0deg); }
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100% { transform: rotate(360deg); }
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}
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/* 响应式设计 */
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@media (max-width: 768px) {
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.main-content {
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padding: 1rem;
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}
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.navbar {
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padding: 1rem;
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}
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.navbar h1 {
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font-size: 1.2rem;
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}
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.image-preview {
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height: 300px;
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}
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|
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.category-buttons {
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flex-direction: column;
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align-items: center;
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}
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.category-btn {
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width: 200px;
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}
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.hairstyle-grid {
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grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
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gap: 1rem;
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}
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.hairstyle-item img {
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height: 120px;
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}
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.result-preview {
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height: 400px;
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}
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}
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@media (max-width: 480px) {
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.image-preview {
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height: 250px;
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}
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.hairstyle-grid {
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grid-template-columns: repeat(3, 1fr);
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}
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.result-preview {
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height: 300px;
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}
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}
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@@ -0,0 +1,109 @@
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>发型更换</title>
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<link rel="stylesheet" href="css/style.css">
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<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
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</head>
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<body>
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<div id="app">
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<!-- 导航栏 -->
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<header class="navbar">
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<h1>发型更换</h1>
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<button id="backBtn" class="back-btn" style="display: none;">返回</button>
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</header>
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<!-- 主内容区 -->
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<main class="main-content">
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<!-- 首页 -->
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<section id="homePage" class="page active">
|
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<!-- 图片上传区 -->
|
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<div class="upload-area">
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<div id="imagePreview" class="image-preview">
|
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<div class="upload-placeholder">
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<div class="upload-icon">📷</div>
|
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<p>点击上传图片或拍摄照片</p>
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<input type="file" id="imageUpload" accept="image/*" capture="camera">
|
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</div>
|
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</div>
|
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</div>
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|
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<!-- 发型分类入口 -->
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<div class="category-section">
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<h2>选择发型分类</h2>
|
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<div class="category-buttons">
|
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<button id="maleBtn" class="category-btn">
|
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<span class="gender-icon">👨</span>
|
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<span>男士发型</span>
|
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</button>
|
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<button id="femaleBtn" class="category-btn">
|
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<span class="gender-icon">👩</span>
|
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<span>女士发型</span>
|
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</button>
|
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</div>
|
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</div>
|
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</section>
|
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|
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<!-- 发型选择页 -->
|
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<section id="hairstylePage" class="page">
|
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<!-- 分类导航 -->
|
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<div class="category-nav">
|
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<button id="navMaleBtn" class="nav-category-btn active">男士</button>
|
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<button id="navFemaleBtn" class="nav-category-btn">女士</button>
|
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</div>
|
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|
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<!-- 发型列表 -->
|
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<div class="hairstyle-list">
|
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<h2>选择发型</h2>
|
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<div id="hairstyleGrid" class="hairstyle-grid">
|
||||
<!-- 发型项将通过JavaScript动态添加 -->
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<!-- 确认按钮 -->
|
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<div class="confirm-section">
|
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<button id="confirmBtn" class="confirm-btn" disabled>确认选择</button>
|
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</div>
|
||||
</section>
|
||||
|
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<!-- 结果预览页 -->
|
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<section id="resultPage" class="page">
|
||||
<!-- 效果展示 -->
|
||||
<div class="result-section">
|
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<h2>发型更换效果</h2>
|
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<div id="resultPreview" class="result-preview">
|
||||
<!-- 结果图片将通过JavaScript动态添加 -->
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<!-- 操作按钮 -->
|
||||
<div class="action-buttons">
|
||||
<button id="reselectHairstyleBtn" class="action-btn">
|
||||
<span class="action-icon">✂️</span>
|
||||
<span>重新选择发型</span>
|
||||
</button>
|
||||
<button id="reuploadImageBtn" class="action-btn">
|
||||
<span class="action-icon">📷</span>
|
||||
<span>重新上传照片</span>
|
||||
</button>
|
||||
<button id="saveResultBtn" class="action-btn">
|
||||
<span class="action-icon">💾</span>
|
||||
<span>保存结果</span>
|
||||
</button>
|
||||
</div>
|
||||
</section>
|
||||
</main>
|
||||
|
||||
<!-- 加载指示器 -->
|
||||
<div id="loading" class="loading" style="display: none;">
|
||||
<div class="loading-spinner"></div>
|
||||
<p>处理中...</p>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<script src="js/api.js"></script>
|
||||
<script src="js/main.js"></script>
|
||||
</body>
|
||||
</html>
|
||||
@@ -0,0 +1,32 @@
|
||||
// API调用封装
|
||||
const API_BASE_URL = '/api';
|
||||
|
||||
// 获取发型列表
|
||||
export async function getHairstyles() {
|
||||
try {
|
||||
const response = await axios.get(`${API_BASE_URL}/hairstyles`);
|
||||
return response.data;
|
||||
} catch (error) {
|
||||
console.error('获取发型列表失败:', error);
|
||||
throw error;
|
||||
}
|
||||
}
|
||||
|
||||
// 更换发型
|
||||
export async function changeHair(imageFile, hairstyleId) {
|
||||
try {
|
||||
const formData = new FormData();
|
||||
formData.append('image', imageFile);
|
||||
formData.append('hairstyle_id', hairstyleId);
|
||||
|
||||
const response = await axios.post(`${API_BASE_URL}/change-hair`, formData, {
|
||||
headers: {
|
||||
'Content-Type': 'multipart/form-data'
|
||||
}
|
||||
});
|
||||
return response.data;
|
||||
} catch (error) {
|
||||
console.error('更换发型失败:', error);
|
||||
throw error;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,318 @@
|
||||
// API调用函数
|
||||
async function getHairstyles() {
|
||||
try {
|
||||
const response = await axios.get('/api/hairstyles');
|
||||
return response.data;
|
||||
} catch (error) {
|
||||
console.error('获取发型列表失败:', error);
|
||||
throw error;
|
||||
}
|
||||
}
|
||||
|
||||
async function changeHair(imageFile, hairstyleId) {
|
||||
try {
|
||||
const formData = new FormData();
|
||||
formData.append('image', imageFile);
|
||||
formData.append('hairstyle_id', hairstyleId);
|
||||
|
||||
const response = await axios.post('/api/change-hair', formData, {
|
||||
headers: {
|
||||
'Content-Type': 'multipart/form-data'
|
||||
}
|
||||
});
|
||||
return response.data;
|
||||
} catch (error) {
|
||||
console.error('更换发型失败:', error);
|
||||
throw error;
|
||||
}
|
||||
}
|
||||
|
||||
// 全局变量
|
||||
let uploadedImage = null;
|
||||
let selectedHairstyle = null;
|
||||
let currentGender = 'male';
|
||||
let hairstylesData = {
|
||||
male: [],
|
||||
female: []
|
||||
};
|
||||
|
||||
// DOM元素
|
||||
const elements = {
|
||||
// 首页元素
|
||||
homePage: document.getElementById('homePage'),
|
||||
imagePreview: document.getElementById('imagePreview'),
|
||||
imageUpload: document.getElementById('imageUpload'),
|
||||
maleBtn: document.getElementById('maleBtn'),
|
||||
femaleBtn: document.getElementById('femaleBtn'),
|
||||
|
||||
// 发型选择页元素
|
||||
hairstylePage: document.getElementById('hairstylePage'),
|
||||
navMaleBtn: document.getElementById('navMaleBtn'),
|
||||
navFemaleBtn: document.getElementById('navFemaleBtn'),
|
||||
hairstyleGrid: document.getElementById('hairstyleGrid'),
|
||||
confirmBtn: document.getElementById('confirmBtn'),
|
||||
|
||||
// 结果预览页元素
|
||||
resultPage: document.getElementById('resultPage'),
|
||||
resultPreview: document.getElementById('resultPreview'),
|
||||
reselectHairstyleBtn: document.getElementById('reselectHairstyleBtn'),
|
||||
reuploadImageBtn: document.getElementById('reuploadImageBtn'),
|
||||
saveResultBtn: document.getElementById('saveResultBtn'),
|
||||
|
||||
// 通用元素
|
||||
backBtn: document.getElementById('backBtn'),
|
||||
loading: document.getElementById('loading')
|
||||
};
|
||||
|
||||
// 初始化函数
|
||||
function init() {
|
||||
// 绑定事件监听器
|
||||
bindEventListeners();
|
||||
|
||||
// 加载发型数据
|
||||
loadHairstyles();
|
||||
}
|
||||
|
||||
// 绑定事件监听器
|
||||
function bindEventListeners() {
|
||||
// 图片上传
|
||||
elements.imageUpload.addEventListener('change', handleImageUpload);
|
||||
|
||||
// 性别分类按钮
|
||||
elements.maleBtn.addEventListener('click', () => navigateToHairstylePage('male'));
|
||||
elements.femaleBtn.addEventListener('click', () => navigateToHairstylePage('female'));
|
||||
|
||||
// 导航栏性别切换
|
||||
elements.navMaleBtn.addEventListener('click', () => switchGender('male'));
|
||||
elements.navFemaleBtn.addEventListener('click', () => switchGender('female'));
|
||||
|
||||
// 确认按钮
|
||||
elements.confirmBtn.addEventListener('click', handleConfirmHairstyle);
|
||||
|
||||
// 返回按钮
|
||||
elements.backBtn.addEventListener('click', handleBack);
|
||||
|
||||
// 结果页操作按钮
|
||||
elements.reselectHairstyleBtn.addEventListener('click', handleReselectHairstyle);
|
||||
elements.reuploadImageBtn.addEventListener('click', handleReuploadImage);
|
||||
elements.saveResultBtn.addEventListener('click', handleSaveResult);
|
||||
}
|
||||
|
||||
// 加载发型数据
|
||||
async function loadHairstyles() {
|
||||
try {
|
||||
showLoading();
|
||||
const response = await getHairstyles();
|
||||
if (response.success) {
|
||||
hairstylesData.male = response.data.male;
|
||||
hairstylesData.female = response.data.female;
|
||||
renderHairstyles(currentGender);
|
||||
}
|
||||
} catch (error) {
|
||||
alert('加载发型数据失败，请刷新页面重试');
|
||||
} finally {
|
||||
hideLoading();
|
||||
}
|
||||
}
|
||||
|
||||
// 处理图片上传
|
||||
function handleImageUpload(e) {
|
||||
const file = e.target.files[0];
|
||||
if (!file) return;
|
||||
|
||||
const reader = new FileReader();
|
||||
reader.onload = function(e) {
|
||||
const imageUrl = e.target.result;
|
||||
uploadedImage = file;
|
||||
|
||||
// 更新预览
|
||||
elements.imagePreview.innerHTML = `
|
||||
<img src="${imageUrl}" alt="上传的图片">
|
||||
`;
|
||||
};
|
||||
reader.readAsDataURL(file);
|
||||
}
|
||||
|
||||
// 导航到发型选择页
|
||||
function navigateToHairstylePage(gender) {
|
||||
if (!uploadedImage) {
|
||||
alert('请先上传图片');
|
||||
return;
|
||||
}
|
||||
|
||||
currentGender = gender;
|
||||
switchGender(gender);
|
||||
showPage(elements.hairstylePage);
|
||||
showBackBtn();
|
||||
}
|
||||
|
||||
// 切换性别
|
||||
function switchGender(gender) {
|
||||
currentGender = gender;
|
||||
|
||||
// 更新导航按钮状态
|
||||
elements.navMaleBtn.classList.toggle('active', gender === 'male');
|
||||
elements.navFemaleBtn.classList.toggle('active', gender === 'female');
|
||||
|
||||
// 重新渲染发型列表
|
||||
renderHairstyles(gender);
|
||||
}
|
||||
|
||||
// 渲染发型列表
|
||||
function renderHairstyles(gender) {
|
||||
const hairstyles = hairstylesData[gender];
|
||||
elements.hairstyleGrid.innerHTML = '';
|
||||
|
||||
hairstyles.forEach(hairstyle => {
|
||||
const hairstyleItem = document.createElement('div');
|
||||
hairstyleItem.className = 'hairstyle-item';
|
||||
hairstyleItem.dataset.id = hairstyle.id;
|
||||
|
||||
hairstyleItem.innerHTML = `
|
||||
<img src="${hairstyle.image_url}" alt="${hairstyle.name}">
|
||||
<p>${hairstyle.name}</p>
|
||||
`;
|
||||
|
||||
// 点击选择发型
|
||||
hairstyleItem.addEventListener('click', () => selectHairstyle(hairstyle.id));
|
||||
|
||||
elements.hairstyleGrid.appendChild(hairstyleItem);
|
||||
});
|
||||
}
|
||||
|
||||
// 选择发型
|
||||
function selectHairstyle(hairstyleId) {
|
||||
// 移除之前的选择状态
|
||||
document.querySelectorAll('.hairstyle-item.selected').forEach(item => {
|
||||
item.classList.remove('selected');
|
||||
});
|
||||
|
||||
// 添加新的选择状态
|
||||
const selectedItem = document.querySelector(`.hairstyle-item[data-id="${hairstyleId}"]`);
|
||||
if (selectedItem) {
|
||||
selectedItem.classList.add('selected');
|
||||
selectedHairstyle = hairstyleId;
|
||||
elements.confirmBtn.disabled = false;
|
||||
}
|
||||
}
|
||||
|
||||
// 处理确认发型选择
|
||||
async function handleConfirmHairstyle() {
|
||||
if (!uploadedImage || !selectedHairstyle) {
|
||||
alert('请上传图片并选择发型');
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
showLoading();
|
||||
const response = await changeHair(uploadedImage, selectedHairstyle);
|
||||
|
||||
if (response.success) {
|
||||
// 显示结果
|
||||
showResult(response.data.result_image);
|
||||
} else {
|
||||
alert(response.message || '处理失败，请重试');
|
||||
}
|
||||
} catch (error) {
|
||||
alert('处理失败，请重试');
|
||||
} finally {
|
||||
hideLoading();
|
||||
}
|
||||
}
|
||||
|
||||
// 显示结果
|
||||
function showResult(resultImage) {
|
||||
elements.resultPreview.innerHTML = `
|
||||
<img src="${resultImage}" alt="发型更换结果">
|
||||
`;
|
||||
showPage(elements.resultPage);
|
||||
showBackBtn();
|
||||
}
|
||||
|
||||
// 处理重新选择发型
|
||||
function handleReselectHairstyle() {
|
||||
showPage(elements.hairstylePage);
|
||||
}
|
||||
|
||||
// 处理重新上传图片
|
||||
function handleReuploadImage() {
|
||||
// 重置图片上传
|
||||
elements.imageUpload.value = '';
|
||||
uploadedImage = null;
|
||||
elements.imagePreview.innerHTML = `
|
||||
<div class="upload-placeholder">
|
||||
<div class="upload-icon">📷</div>
|
||||
<p>点击上传图片或拍摄照片</p>
|
||||
<input type="file" id="imageUpload" accept="image/*" capture="camera">
|
||||
</div>
|
||||
`;
|
||||
|
||||
// 重新绑定事件
|
||||
document.getElementById('imageUpload').addEventListener('change', handleImageUpload);
|
||||
|
||||
// 重置选择状态
|
||||
selectedHairstyle = null;
|
||||
elements.confirmBtn.disabled = true;
|
||||
document.querySelectorAll('.hairstyle-item.selected').forEach(item => {
|
||||
item.classList.remove('selected');
|
||||
});
|
||||
|
||||
showPage(elements.homePage);
|
||||
hideBackBtn();
|
||||
}
|
||||
|
||||
// 处理保存结果
|
||||
function handleSaveResult() {
|
||||
const resultImage = elements.resultPreview.querySelector('img');
|
||||
if (resultImage) {
|
||||
// 创建下载链接
|
||||
const link = document.createElement('a');
|
||||
link.href = resultImage.src;
|
||||
link.download = 'hairstyle-result.jpg';
|
||||
link.click();
|
||||
}
|
||||
}
|
||||
|
||||
// 处理返回按钮
|
||||
function handleBack() {
|
||||
if (elements.resultPage.classList.contains('active')) {
|
||||
showPage(elements.hairstylePage);
|
||||
} else if (elements.hairstylePage.classList.contains('active')) {
|
||||
showPage(elements.homePage);
|
||||
hideBackBtn();
|
||||
}
|
||||
}
|
||||
|
||||
// 显示页面
|
||||
function showPage(page) {
|
||||
// 隐藏所有页面
|
||||
[elements.homePage, elements.hairstylePage, elements.resultPage].forEach(p => {
|
||||
p.classList.remove('active');
|
||||
});
|
||||
|
||||
// 显示目标页面
|
||||
page.classList.add('active');
|
||||
}
|
||||
|
||||
// 显示返回按钮
|
||||
function showBackBtn() {
|
||||
elements.backBtn.style.display = 'block';
|
||||
}
|
||||
|
||||
// 隐藏返回按钮
|
||||
function hideBackBtn() {
|
||||
elements.backBtn.style.display = 'none';
|
||||
}
|
||||
|
||||
// 显示加载指示器
|
||||
function showLoading() {
|
||||
elements.loading.style.display = 'flex';
|
||||
}
|
||||
|
||||
// 隐藏加载指示器
|
||||
function hideLoading() {
|
||||
elements.loading.style.display = 'none';
|
||||
}
|
||||
|
||||
// 初始化应用
|
||||
init();
|
||||
Reference in New Issue
Block a user