从路由中获取参数

  1. app.route('/projects/:projectId/test_targets')
  2.     .all(function(req, res, next) {
  3.         const projectId: string = req.params.projectId;
  4.         next();
  5.     })

route的应用

  1. app.route('/projects/:projectId')
  2.     .all(function(req, res, next) {
  3.         const projectId: string = req.params.projectId;
  4.               let project;
  5.               /* 获取project*/
  6.         if (project === undefined) {
  7.             res.send({ status: -1, msg: '项目id无效' });
  8.             return;
  9.         }
  10.               res.locals.project = project;
  11.         next();
  12.     })
  13.     .get(function(req, res) {
  14.               let project = res.locals.project;
  15.         /* 获取项目数据*/
  16.         res.send({ status: 0, msg: '获取项目数据成功', data: project });
  17.     })
  18.     .put(function(req, res, next) {
  19.               let project = res.locals.project;
  20.         /* 更新代码*/
  21.         res.send({ status: 0, msg: '修改项目成功', data: project });
  22.         next();
  23.     })
  24.     .delete(function(req, res, next) {
  25.               let project = res.locals.project;
  26.         /* 删除代码*/
  27.         res.send({ status: 0, msg: '删除项目成功', data: project });
  28.         next();
  29.     })
  30.     .all(function(req, res) {
  31.         /* 持久化代码*/
  32.     });

res.locals可以保存一些临时数据,可在一系列的中间件之间传递.
对比app.locals,app.locals是对app中所有中间件有效,而res.locals则仅对处理当前请求的中间件有效.