在Node js中使用Express模块不工作
我正在按照这里的例子使用Node JS的'express'模块
当我尝试运行服务器并打开“localhost：8000”时，出现错误：
Error: No default engine was specified and no extension was provided. at new View (/home/anr/node_modules/express/lib/view.js:41:42) at Function.app.render (/home/anr/node_modules/express/lib/application.js:486:12) at ServerResponse.res.render (/home/anr/node_modules/express/lib/response.js:798:7) at app.post.res.send.status (/home/anr/Desktop/node js/mvc/ntwitter.js:16:7) at callbacks (/home/anr/node_modules/express/lib/router/index.js:164:37) at param (/home/anr/node_modules/express/lib/router/index.js:138:11) at pass (/home/anr/node_modules/express/lib/router/index.js:145:5) at Router._dispatch (/home/anr/node_modules/express/lib/router/index.js:173:5) at Object.router (/home/anr/node_modules/express/lib/router/index.js:33:10) at next (/home/anr/node_modules/express/node_modules/connect/lib/proto.js:193:15) 我在那里添加了文件夹结构，现在partials文件夹包含：
chirps.html index.html styles.html view0.html
view0由基本的html模板组成：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <!-- There is a call to partial here--> <%- partial('partials/stylesheet', stylesheets) %> <title><%= title %></title> </head> <body> <h1><%= header %></h1> <%- body %> </body> </html>
我的代码索引部分是在这里：
<form method="POST" action="/send"> <input type="text" length="140" name="tweet"/> <input type="submit" value="Tweet"/> </form> <%- partial('partials/chirp','tweets') %>
这是我的唧唧声：
<p><%= chirps %></p>
这是我的app.js：
var express=require('express'); //express gets http behind the scenes... var app = express.createServer(); app.listen(8000); var tweets=[]; //use http verbs instead of registering event listeners to http //responds only to a get request... app.get('/',function(req,res){ //a conveniance method that does request headers,sends the message and ends the response //res.send('Welcome to Node Twitter'); var title='Chirpie', header='Welcome To Chirpie'; res.render('index', { locals:{ 'title':title, 'header':header, 'tweets':tweets, //'stylesheets':['public/style.css'] } }); }); //the second argument in the post request is known as middleware app.post('/send',express.bodyParser(),function(req,res){ if(req.body && req.body.tweet) { tweets.push(req.body.tweet); if (acceptsHtml(req.headers['accept'])); { console.log('tweet recieved'); res.redirect('/', 302); // the 302 status code indicates that this is not a permanent move //go to /send before redirecting every time } } else { console.log('tweet recieved'); res.send({ status: 'ok', message: 'tweet recieved' }); } }); app.get('/tweets',function(req,res) { res.send(tweets); }); function acceptsHtml(header) { var accepts=header.split(','); for(var i=0;i<accepts.length;i+=1) { if(accepts[i]==='text/html') return true; } return false; }
编辑：
一些通过评论修复的问题：
1. Fixed `if (acceptsHtml(req.headers['accept']));`.Removed the semicolon there. 2.The files have to use `.ejs` unless the render specifies it as `.html` which requires the html module.Also move the `index.ejs` to `views`. 3.The reference to `chirp.ejs` was removed.Another point to note would be that the rendering engine is supposed to handle these calls now, the function `partial` no longer. exists,if you wish to use something like that use `include` instead.
所以这个路由的响应结束时的代码是：
app.get('/',function(req,res){ //a conveniance method that does request headers,sends the message and ends the response //res.send('Welcome to Node Twitter'); var title='Chirpie', header='Welcome To Chirpie'; res.render('index', { locals:{ 'title':title, 'header':header, 'tweets':tweets, } }); });
你有EJS的观点，但是你从来没有告诉过Express，所以对于如何渲染它们是无能为力的。
在app = express.createServer() ，添加：
app.set('view engine', 'ejs');