[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_11":-5},"routes/user.$name.topics",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":16},"topics",[34],"user",{"_20":21,"_13":14,"_22":23,"_24":14,"_25":26,"_27":28,"_29":16,"_30":31,"_32":33},"loginname","taihangy","page",1,"limit",20,"total","id","13476","avatar_url","https://avatars.githubusercontent.com/u/8213111?v=3","githubUsername","create_at","2014-07-20 03:32:21.78","score",5,"topic_count","reply_count",0,"is_star",false,{"_20":35,"_36":21,"_37":38,"_39":40,"_41":42,"_43":44,"_45":33,"_46":33,"_30":47,"_48":49,"_25":50,"_51":52},"14309","author_id","tab","ask","content","刚开始学习Nodejs，跟着教程做blog，但是做到注册新用户，输入用户名，密码之类，点击注册后，直接报错：\r\nTypeError: Cannot read property 'username' of undefined\r\n at /Users/yetaihang/WebstormProjects/blog/routes/index.js:18:28\r\n at Layer.handle [as handle_request] (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/layer.js:95:5)\r\n at next (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/route.js:131:13)\r\n at Route.dispatch (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/route.js:112:3)\r\n at Layer.handle [as handle_request] (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/layer.js:95:5)\r\n at /Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/index.js:277:22\r\n at Function.process_params (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/index.js:330:12)\r\n at next (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/index.js:271:10)\r\n at expressInit (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/middleware/init.js:33:5)\r\n at Layer.handle [as handle_request] (/Users/yetaihang/WebstormProjects/blog/node_modules/express/lib/router/layer.js:95:5)\r\n\t\r\n我的表单注册页面如下：\r\n<%- include header %>\r\n\r\n<%- include footer %>\r\n\r\n我的后端服务器处理post代码如下：\r\n\r\napp.post('/reg', function (req, res) {\r\n **var username = req.body['username'];**\r\n var password = req.body['password'];\r\n var password_re = req.body['password-repeat'];\r\n //检验用户两次输入的密码是否一致\r\n if (password_re != password) {\r\n req.flash('error', '两次输入的密码不一致!'); \r\n return res.redirect('/reg');//返回主册页\r\n }\r\n //生成密码的 md5 值\r\n var md5 = crypto.createHash('md5'),\r\n password = md5.update(req.body.password).digest('hex');\r\n var newUser = new User({\r\n name: req.body.name,\r\n password: password,\r\n email: req.body.email\r\n });\r\n //检查用户名是否已经存在 \r\n User.get(newUser.name, function (err, user) {\r\n if (user) {\r\n req.flash('error', '用户已存在!');\r\n return res.redirect('/reg');//返回注册页\r\n }\r\n //如果不存在则新增用户\r\n newUser.save(function (err, user) {\r\n if (err) {\r\n req.flash('error', err);\r\n return res.redirect('/reg');//注册失败返回主册页\r\n }\r\n req.session.user = user;//用户信息存入 session\r\n req.flash('success', '注册成功!');\r\n res.redirect('/');//注册成功后返回主页\r\n });\r\n });\r\n });\r\n \r\n 在第一步var username = req.body['username'];就发生了错误，因为小弟刚开始学，不知道怎么样才能debug？","title","提交表单发现表单中的属性是undefined","last_reply_at","2015-10-09 03:30:12.678","good","top",3,"visit_count",5631,"2015-10-06 02:37:46.555","author",{"_13":14,"_22":23}]