learning express step(九)
router-level middleware works in the same way as application-level middleware, except it is bound to an instance of express.Router().
code:
var express = require('express');
var app = express();
var router = express.Router(); // a middleware function with no mount path. This code is executed for every request to the router
router.use(function (req, res, next) {
console.log('Time:', Date.now());
next()
}); // a middleware sub-stack shows request info for any type of HTTP request to the /user/:id path
router.use('/user/:id', function (req, res, next) {
console.log('Request URL:', req.originalUrl);
next()
}, function (req, res, next) {
console.log('Request Type:', req.method);
next()
}); // a middleware sub-stack that handles GET requests to the /user/:id path
router.get('/user/:id', function (req, res, next) {
// if the user ID is 0, skip to the next router
if (req.params.id === '') next('route');
// otherwise pass control to the next middleware function in this stack
else next()
}, function (req, res, next) {
// render a regular page
res.send('regular');
}); // handler for the /user/:id path, which renders a special page
router.get('/user/:id', function (req, res, next) {
console.log(req.params.id);
res.send('special');
}); app.set('view engine','jade');
// mount the router on the app
app.use('/', router); app.listen();
result:
learning express step(九)的更多相关文章
- learning express step(十四)
learning express error handle code: const express = require('express'); const app = express(); const ...
- learning express step(十三)
learning express error handle code: const express = require('express'); const app = express(); app.g ...
- learning express step(十二)
learning express view engine function const express = require('express'); const app = express(); app ...
- learning express step(十一)
learning express.Router() code: const express = require('express'); const app = express(); var route ...
- learning express step(五)
learning express middleware var express = require('express'); var app = express(); var myLogger = ...
- learning express step(四)
learning express route function const express = require('express'); const app = express(); app.get(' ...
- learning express step(八)
To skip the rest of the middleware functions from a router middleware stack, call next('route') to p ...
- learning express step(七)
Route handlers enable you to define multiple routes for a path. The example below defines two routes ...
- learning express step(六)
code: use application middleware var express = require('express'); var app = express(); app.use(func ...
随机推荐
- PAT(B) 1018 锤子剪刀布(C:20分,Java:18分)
题目链接:1018 锤子剪刀布 分析 用一个二维数组保存两人所有回合的手势 甲乙的胜,平,负的次数刚好相反,用3个变量表示就可以 手势单独保存在signs[3]中,注意顺序.题目原文:如果解不唯一,则 ...
- STM32固件库模板下载以及固件库学习方法
固件库模板下载 固件库模板新建过程: 下载我们上节的固件库文件 电脑新建一个文件夹命名为Fwlib-Template,在此文件夹下分别新建DOC Libraries Project User 这四个文 ...
- SAS学习笔记33 格式修饰符
冒号(:)格式修饰符 从非空格开始读取变量所对应的数据,直到满足以下任何一种情况 遇到下一个空格列 对应变量所定义的长度已经读满 数据行结束 &格式修饰符 修饰所读取为字符型的列数据中含有一个 ...
- Redis键的基本操作
1.Redis键的键名查询 ·命令名称:KEYS ·语法:KEYS pattern ·Pattern的用法: ? 任意一个字符 * 任意个任意字符 [ae] a或者e [^ae] 除了a和e [a-c ...
- (九)Activitivi5之使用 RuntimeService 设置和获取流程变量
一.案例 /** * 设置流程变量数据 */ @Test public void setVariableValues(){ RuntimeService runtimeService=processE ...
- 前端关于 superSlide.js 使用,一款基于jquery的前端控件
1引用jQuery.js 和 jquery.SuperSlide.js 2 编写HTML ** 以下是默认的HTMl结构,分别是 ".hd" 里面包含ul, ".bd&q ...
- mysql8中查询语句表别名不能使用 “of”
今天在迁移一个项目的时候,发现有一个sql报错,但是语句跟迁移之前完全一样,所以想来应该是 mysql 版本差异导致的. 迁移之前版本:5.6.28(腾讯云) 迁移之后版本:8.0.16(阿里云) 新 ...
- django 2.0 xadmin 错误集锦
转载 django 2.0 xadmin 错误集锦 2018-03-26 10:39:18 Snail0Li 阅读数 5188更多 分类专栏: python 1.django2.0把from dj ...
- SQL Server注入
1.利用错误消息提取信息 1.1 枚举当前表与列 --' 抛出错误:选择列表中的列 'users.id' 无效,因为该列没有包含在聚合函数或 GROUP BY 子句中. 发现表名为 'users',存 ...
- react中key值的理解
react利用key来识别组件,它是一种身份标识标识,相同的key react认为是同一个组件,这样后续相同的key对应组件都不会被创建有了key属性后,就可以与组件建立了一种对应关系,react根据 ...