二手市场交易平台，前台主要实现的功能有：按分类显示商品列表、搜索商品、登录注册、关注商品、评论商品、购买商品、用户登录后购买商品、发布商品、查看订单、查看关注的商品、修改个人信息等。后台主要功能有：用户管理、商品管理、订单管理、用户余额管理、管理员密码修改等(Second-hand market trading platform, the main functions of the front desk are: displaying commodity list by classification, searching commodities, login registration, paying attention to commodities, reviewing commodities, purchasing commodities, purchasing commodities after user login, publishing commodities, viewing orders, viewing commodities of concern, modifying personal information, etc. The main functions of the background include: user management, commodity management, order management, user balance management, administrator password modification, etc.)