Node.js學(xué)習(xí)之路27——Express的router對(duì)象

NicolasHe 發(fā)布于2019-08-22 15:00 / 825人閱讀

摘要：對(duì)象大小寫(xiě)敏感默認(rèn)不敏感保留父路由器的必需參數(shù)值如果父項(xiàng)和子項(xiàng)具有沖突的參數(shù)名稱則該子項(xiàng)的值將優(yōu)先激活嚴(yán)格路由默認(rèn)禁用禁用之后正常訪問(wèn)但是不可以訪問(wèn)全部調(diào)用或者或者實(shí)際上就是的各種請(qǐng)求方法使用路由使用模塊方法

Router([options])

let router = express.Router([options]);

options對(duì)象

caseSensitive,大小寫(xiě)敏感,默認(rèn)不敏感

mergeParams,保留父路由器的必需參數(shù)值,如果父項(xiàng)和子項(xiàng)具有沖突的參數(shù)名稱,則該子項(xiàng)的值將優(yōu)先

strict,激活嚴(yán)格路由,默認(rèn)禁用,禁用之后/uu正常訪問(wèn),但是/uu/不可以訪問(wèn)

1. router.all

全部調(diào)用

router.all(path, [callback, ...] callback)

router.all("*", fn1, fn2...);
// 或者
router.all("*", fn1);
router.all("*", fn2);
// 或者
router.all("/user", fn3);

2. router.METHOD

router.METHOD(path, [callback, ...] callback)

實(shí)際上就是ajax的各種請(qǐng)求方法

router.get("/", (req, res, next) => {
    
})

router.post("/", (req, res, next) => {
    
})

3. router.route(path)

var router = express.Router();

router.param("user_id", function(req, res, next, id) {
  // sample user, would actually fetch from DB, etc...
  req.user = {
    id: id,
    name: "TJ"
  };
  next();
});

router.route("/users/:user_id")
.all(function(req, res, next) {
  // runs for all HTTP verbs first
  // think of it as route specific middleware!
  next();
})
.get(function(req, res, next) {
  res.json(req.user);
})
.put(function(req, res, next) {
  // just an example of maybe updating the user
  req.user.name = req.params.name;
  // save user ... etc
  res.json(req.user);
})
.post(function(req, res, next) {
  next(new Error("not implemented"));
})
.delete(function(req, res, next) {
  next(new Error("not implemented"));
})

4. router.use 4.1 使用路由

var express = require("express");
var app = express();
var router = express.Router();

// simple logger for this router"s requests
// all requests to this router will first hit this middleware
router.use(function(req, res, next) {
  console.log("%s %s %s", req.method, req.url, req.path);
  next();
});

// this will only be invoked if the path starts with /bar from the mount point
router.use("/bar", function(req, res, next) {
  // ... maybe some additional /bar logging ...
  next();
});

// always invoked
router.use(function(req, res, next) {
  res.send("Hello World");
});

app.use("/foo", router);

app.listen(3000);

4.2 使用模塊方法

var logger = require("morgan");

router.use(logger());
router.use(express.static(__dirname + "/public"));
router.use(function(req, res){
  res.send("Hello");
});