flowchart TD A[首页] --> B[产品分类] A --> C[搜索功能] A --> D[促销活动] A --> E[用户中心] B --> F[生鲜区] B --> G[日用品区] B --> H[电子产品区] B --> I[服装区] F --> JA[浏览生鲜产品] F --> JB[查看详细信息] G --> KA[浏览日用品] G --> KB[查看详细信息] H --> LA[浏览电子产品] H --> LB[查看详细信息] I --> MA[浏览服装] I --> MB[查看详细信息] C --> N[显示搜索结果] N --> O[选择产品] D --> P[查看当前促销] P --> Q[选择促销产品] E --> R[个人信息] E --> S[购物车] E --> T[订单历史] T --> U[查看订单详情] classDef topLevel fill:#f9f,stroke:#333,stroke-width:2px; classDef category fill:#bbf,stroke:#333,stroke-width:2px; class A topLevel; class B,C,D,E category;