前端请求：

http://localhost:3002/api/user/login?username=002&password=002

后端响应

router.get('/api/user/login', (req, res) => {let username = req.query.username;let password = req.query.password;const sqlStr = `SELECT * FROM sys_user where username= '${username}' and password='${password}'`console.log(sqlStr)db.query(sqlStr, (err, results) => {// 查询数据失败if (err) {return console.log(err.message)} else {res.send({status: 200,message: '获取所有用户成功',data: results,})}})})

结论：使用req.query.参数名 获取参数值

执行效果