无法将表单数据提取到mongoDB
这是我的app.js：
var express = require("express"), mongo = require("mongodb"), db = require("monk")("localhost:27017/nodemails"), bodyParser = require("body-parser"), logger = require("morgan"), path = require("path"); var app = express(); var router = express.Router(); var port = 3000; app.use(router); app.use(express.static(__dirname, "public")); app.use(logger("dev")); router.use(bodyParser.urlencoded({extended: true})); router.use(bodyParser.json()); // Connect my DB here app.use(function (req,res,next) { req.db = db; next(); }); // Catch 404 error app.use(function (req,res,next) { var err = new Error("Not found"); err.status = 404; next(err); }); // Development error handler if (app.get("env") === "development") { app.use(function (err,req,res,next) { res.status(err.status || 500); res.json({ message: err.message, error: err }); }); } // Production error handler: no stacktraces app.use(function (err,req,res,next) { res.status (err.status || 500); res.json({ message: err.message, error : {} }); }); router.all("/", function (req,res,next) { console.log("Visit registered"); next(); }); // Join homepage router.get("/", function (req,res) { res.sendFile(path.join(__dirname, "public", "collection.html")); }); // Upload email to DB router.post("/addMail", function (req,res) { var db = req.db; var userEmail = req.body.useremail; console.log(req.body.useremail); var collection = db.get("usercollection"); collection.insert({"email": userEmail}, function (err,doc) { if (err) { res.send("Somehow it is error, bruh"); } else { res.redirect(__dirname, "public", "/thankyou.html"); } }); }); app.listen(port); module.exports = app; 这是我的HTML文件的forms：
<!DOCTYPE html> <html> <head> </head> <body> <form id="mailForm" action="/addMail" method="post"> <div> <label for="useremail">Email: </label> <input type="text" id="useremail" name="useremail"> </input> </div> <input type="submit" value="Submit"> </input> </form> </body> </html>
我解决了req.body未定义的问题（将router.get和router.postreplace为app.post和app.get）。 但是，现在，错误消息是（当我填写表单，然后单击提交button）：
{"message":"Cannot read property 'get' of undefined","error":{}}
帮我解决这个问题 ，我相信这个错误是愚蠢的，因为我缺乏专业知识。
PS：这是我在package.json文件中的依赖关系：
"dependencies": { "body-parser": "~1.10.2", "express": "~4.11.1", "mongodb": "*", "monk": "*", "morgan": "*" }
PSS：mongoDB已经build立并正在运行。
那是因为你正在把db定义为
var db = req.db;
这是未定义的
db是你的数据库实例，只有注释行，因为最初已经定义了：
db = require("monk")("localhost:27017/nodemails"),
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