我正在按照示例使用 Node JS 的“快速”模块 here
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 文件夹包括:
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>
我的索引部分代码在这里:
<form method="POST" action="/send">
<input type="text" length="140" name="tweet"/>
<input type="submit" value="Tweet"/>
</form>
<%- partial('partials/chirp','tweets') %>
这是我的唧唧声部分:
<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:
通过评论修复的一些问题:
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.
所以在所有这一切结束时，这条路线的响应代码是:
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,
}
});
});
最佳答案
你有 EJS View ，但你从未告诉 Express，所以它对如何呈现它们一无所知。
在 app = express.createServer() 之后，添加:
app.set('view engine', 'ejs');
关于javascript - 在 Node js 中使用 Express 模块不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21213342/