Question

在快递申请中，我使用app.js中声明的快递路由器作为：

var adminRouter = require('./admin');
app.use("/admin", adminRouter);

所以它引用我在其中定义此特定路由的admin.js文件：

 router.route('/rooms/edit/:id')
    .all(function(req, res, next) {
        var roomid = req.params.id;
        var room = _.find(rooms, r => r.id == roomid);
        if (!room) {
            res.sendStatus(404);
            return;
        }
        res.locals.room = room;
        next();
    }).get(function(req, res) {

        res.render('edit', { room: room });
    }).post(function(req, res) {

        res.locals.room.name = req.body.name;
        res.redirect('./'); 
    });

但是在编辑房间名称的视图中（由上面路由中的.get方法访问）我收到此错误，指出我room中存储的res.locals变量未定义：

ReferenceError: room is not defined

这是整个app.js

var express = require('express');
var app = express();
var bodyParser =  require('body-parser');


app.set("views", "./views");
app.set("view engine", "jade");

app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended:true}));


app.use(function(req, res, next){
    console.log('incomming req : ' + req.url);
    next();
});

app.get('/', function(req, res){
    res.render('index', {title:'Home'});
});

var adminRouter = require('./admin');
app.use("/admin", adminRouter);

app.listen(3000, function(){
    console.log('app running on port 3000');
});

这也是edit.jade视图：

extends layout
block content
 h1 Edit chatroom!!
 form(method="POST")
      fieldset.form-group
          label(for="name") Name:
          input.form-control(name="name", type="text", placeholder="Enter a name" value="#{room.name}")
          small.text-muted Give your chatroom a meaningful name for people to refer to it.
      button.btn.btn-primary(type="submit") Save chatroom
      a.btn.btn-default(href="/admin/rooms") Cancel

Answer 1

我收到此错误，指出我room中存储的res.locals变量未定义：
ReferenceError: room is not defined

这不是错误所说的内容：它表示未定义名为room的变量。它本应该指向发生错误的代码行，在这里：

res.render('edit', { room: room });

事实上，room 未定义。

存储在`res.locals`中的Express.js：变量未在视图中定义

1 个答案: