Question

我有一些提供此错误的Node.js代码

有人能告诉我这个错误意味着什么，我该怎么做才能解决它？

非常感谢！

if (fn.handle && fn.set) app = fn;
        ^

TypeError: Cannot read property 'handle' of undefined

at Function.app.use (/Users/sylvia/Documents/FE/Daily-

Learning/Node/final/node_modules/express/lib/application.js:110:9)

at Object.<anonymous> (/Users/sylvia/Documents/FE/Daily- Learning/Node/final/server.js:46:8)

at Module._compile (module.js:409:26)

at Object.Module._extensions..js (module.js:416:10)

at Module.load (module.js:343:32)

at Function.Module._load (module.js:300:12)

at Function.Module.runMain (module.js:441:10)

at startup (node.js:140:18)

at node.js:1043:3

代码：

var express = require('express');
var expressStatic = require('express-static');
var mysql = require('mysql');
var cookieParser = require('cookie-parser');
var cookieSession = require('cookie-session');
var bodyParser = require('body-parser');
var consolidate = require('consolidate');
var expressRoute = require('express-route');
var multer = require('multer');
var multerObj = multer({dest:'./static/upload'});

var server = express();
server.listen(8080);

server.use(multerObj.any());
server.use(cookieParser());

(function(){
    var keys=[];

    for(var i=0;i<100000;i++){
        keys[i]='a_' + Math.random();
    }

    server.use(cookieSession({
        name: 'sess_id',
        keys: keys,
        maxAge: 20*60*1000 //20mins
    }));
})();

server.engine('html',consolidate.ejs);

server.set('views','template');
server.set('view engine','html');

var r1 = express.Router();
var r2 = express.Router();

server.use('/article/',r1);

r1.get('/1.html',(req,res)=>{
    res.send('aaa').end();
});

r1.get('/2.html',(req,res)=>{
    res.send('bbb').end();
});

server.use('/blog/',r2);

r2.get('/a.html',(req,res)=>{
    res.send('ccc').end();
});

r2.get('/b.html',(req,res)=>{
    res.send('ddd').end();
});


server.use(expressStatic('./static/'));

Answer 1

问题在于旧版本的express.js。该错误将在线上抛出

server.use('/article/',r1);

因为r1未定义。您需要将Express版本升级到4.x.x，因为路由器在3.x.x版本中不可用。您可以使用此命令执行此操作：

npm install express@4.13.4 --save

Node.js - TypeError：无法读取未定义

1 个答案: