为什么我不能使用节点在 express 中发布数据？

Question

Below is my code

var express = require("express");
var app = express();
var session = require('express-session');
var login = express.Router();
var bodyParser = require("body-parser");

app.use(bodyParser.urlencoded({ extended: false }));
app.use(session({
  secret: "HelloExpressSESSION",
  resave: true,
  saveUninitialized: true
}));

login.get('/login_page', function(req, res){
  if(req.session.logined) {
      res.send('<a href=\"/logout\">Logout</a>');
      res.end();
      return;
   }

res.send('<form action=\"/login\" method=\"POST\">' +
    '<input type=\"text\" name=\"username\">' +
    '<br/>' +
    '<input type=\"password\" name=\"password\">' +
    '<br/>' +
    '<input type=\"submit\" value=\"Log In\">' +
    '</form>');
  res.end();
});

login.post('/login', function(req, res) {
  if(req.body.username != 'user' || req.body.password != '123456789') {
      res.send('Wrong information!');
      res.end();
      return;
  }

req.session.logined = true;
  console.log("hi");
  res.redirect('/login_page');
  res.end();
});

login.post('/logout', function(req, res) {
  req.session.logined = false;
  res.redirect('/login');
  res.end();
});

app.use('/', login);
app.listen(12345);

Everything is ok, I can input user/123456789 and then show Logout link. However, after I click Logout link, it shows "Cannot GET /logout" on the page.

Did I missing something?

Answer 1

You only have a route for a POST operation for /logout . Clicking on a link would generate a GET request, not a POST .

Perhaps you mean to change this to a GET handler like this - change login.post() to login.get() :

login.get('/logout', function(req, res) {
  req.session.logined = false;
  res.redirect('/login');
  res.end();
});