Express 4.0：找不到模块'html'＆找不到模块'把手'
[英]Express 4.0: Cannot find module 'html' & Cannot find module 'handlebars'
问题描述
For the past hour or so I've been trying to figure out why I keep getting the following error when starting an Express 4.0 application: 
在过去一小时左右的时间里，我一直试图弄清楚为什么在启动Express 4.0应用程序时出现以下错误：
Error: Cannot find module 'html'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at new View (e:\Multivision\node_modules\express\lib\view.js:43:49)
at Function.app.render (e:\Multivision\node_modules\express\lib\application.
js:499:12)
at ServerResponse.res.render (e:\Multivision\node_modules\express\lib\respon
se.js:955:7)
at e:\Multivision\server.js:11:6
at Layer.handle [as handle_request] (e:\Multivision\node_modules\express\lib
\router\layer.js:76:5)
at next (e:\Multivision\node_modules\express\lib\router\route.js:100:13)
Basically, I just want to use plain html files for my views, as I am experimenting with the MEAN stack. 基本上，我只想在我的视图中使用普通的html文件，因为我正在尝试使用MEAN堆栈。 Below you can find two different versions of the app.js code that I am trying to run: 您可以在下面找到我尝试运行的两个不同版本的app.js代码：
VERSION 1 版本1
var express = require('express'),
app = express();
var env = process.env.NODE_ENV = process.env.NODE_ENV || 'development',
port = 3000;
app.set('views', __dirname + '/server/views');
app.set('view engine', 'html');
app.get('*', function(req, res) {
res.render('index');
});
app.listen(port);
console.log('Listening on port ' + port + '...');
VERSION 2 版本2
var express = require('express'),
app = express();
var env = process.env.NODE_ENV = process.env.NODE_ENV || 'development',
port = 3000;
app.set('views', __dirname + '/server/views');
app.engine('html', require('consolidate').handlebars);
app.set('view engine', 'html');
app.get('*', function(req, res) {
res.render('index');
});
app.listen(port);
console.log('Listening on port ' + port + '...');
When running VERSION 2 of the code, I get the following eror: 运行代码的VERSION 2时，我得到以下错误：
Error: Cannot find module 'handlebars'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Function.exports.handlebars.render (e:\Multivision\node_modules\consolida
te\lib\consolidate.js:488:62)
at e:\Multivision\node_modules\consolidate\lib\consolidate.js:146:25
at e:\Multivision\node_modules\consolidate\lib\consolidate.js:99:5
at fs.js:266:14
at Object.oncomplete (fs.js:107:15)
VIEW (INDEX.HTML) 查看（INDEX.HTML）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Test Application</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>
I have already looked at the other questions on this topic on StackOverflow, but could not find a proper solution. 我已经在StackOverflow上查看了有关此主题的其他问题，但找不到合适的解决方案。 I would really appreciate it if someone could point me in the right direction or, even better, explain why this is happening. 如果有人能指出我正确的方向，或者甚至更好地解释为什么会这样，我真的很感激。
2 个解决方案
解决方案1
8 已采纳 2014-08-07 11:53:32
From the consolidate documentation: 从合并文档：
NOTE: you must still install the engines you wish to use, add them to your package.json dependencies. 注意：您仍然必须安装要使用的引擎，将它们添加到package.json依赖项中。
Run the following and try again. 运行以下命令，然后重试。
npm install --save handlebars
解决方案2
0 2016-09-06 22:01:12
Sometimes this error can occur if the wrong case is used when importing the module. 如果在导入模块时使用了错误的情况，有时会发生此错误。
For example: 例如：
import Handlebars from 'Handlebars'
will work on MacOS, as it has a case insensitive filesystem. 将适用于MacOS，因为它有一个不区分大小写的文件系统。
But on a Linux machine (with a case sensitive filesystem), you'll need to match the exact defined in the Handlebars module, which would look like: 但是在Linux机器上（带有区分大小写的文件系统），您需要匹配Handlebars模块中的确切定义，如下所示：
import handlebars from 'handlebars'.
(The above applies to the new ES6 modules and the older require() format.) （以上内容适用于新的ES6模块和较旧的require（）格式。）
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