正在尝试使用内容标题将锚链接添加到内容正文

我使用MongoDB在Express中创建了一个简单的注释系统。用户简单地使用主屏幕上的表格来输入标题&一条评论，然后它会出现在页面底部的列表中。

然而，在它只是在页面上显示评论标题和正文之前，我想尝试和做的是链接标题，这样当你点击它时，它就会显示评论内容。

我的型号：

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var CommentSchema = new Schema({
    title: String,
    content: String,
    created: Date
});
module.exports = mongoose.model('Comment', CommentSchema);

我的观点：

extends layout
block content
  h1= title
  div.addCommentForm
        form( method="post", action="/create")
            div
                div
                    span.label Title :
                    input(type="text", class="nameTxt", name="title")
                div
                    span.label Comment :
                    textarea(name="comment")
                div#addCommentSubmit
                    input(type="submit", value="Save")
  br
  br
  #comments
    - each comment in comments
      div.comment
        a(href=comment.title) #{comment.title}
        div.name= comment.title
        div.content= comment.content 
        hr

我的应用程序js:

require('./models/comments'); // require the model before the 'index.js' file is called
var express = require('express');
var path = require('path');
var favicon = require('static-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var routes = require('./routes/index');
var create = require('./routes/create');
var show = require('./routes/show');
var app = express();
// Database stuff
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/comments-app');
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(favicon());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', routes);
app.use('/create', create);
**app.use('/:comment.title', show)**; // add to render the comments content
/// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});
/// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});

module.exports = app;

我的演出路线：

var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');
var Comment = mongoose.model('Comment', Comment);
router.get('/:comment.title', function(req, res) {
    res.send(comment.content)
});
module.exports = router;

当我点击应用程序中的评论标题时，我会看到一个相当长的错误。

Not Found
404
Error: Not Found
    at Layer.app.use.res.render.message [as handle] (/Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/app.js:37:15)
    at trim_prefix (/Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:240:15)
    at /Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:208:9
    at Function.proto.process_params (/Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:269:12)
    at next (/Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:199:19)
    at next (/Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:176:38)
    at next (/Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:176:38)
    at /Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:137:5
    at /Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:250:10
    at next (/Users/Keva161/Documents/Projects/Webapps/Node/Express4-Comments-Mongoose/node_modules/express/lib/router/index.js:160:14)

关于我为什么会出现这个错误，以及如何修复它，从而达到预期的行为，有什么想法吗？