javascript 如何为 Node.js 创建模块？
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How to create modules for Node.js?
提问by dail
I have a simple code:
我有一个简单的代码：
var http = require("http");
var server = http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type" : "text/html"});
response.write("Hello World");
response.end();
});
server.listen(8000);
console.log("Server has started.");
I would like to put this code into server.js. This code has to be a MODULE that has many internal functions. I would like to create servermodule and listen()function inside it.
我想将此代码放入 server.js。此代码必须是具有许多内部功能的 MODULE。我想在其中创建server模块和listen()函数。
I should put createServer()inside a function called listen().
我应该createServer()在一个名为listen().
If I have index.js how can I call this module and then do something like server.listen()?
如果我有 index.js 我怎么能调用这个模块然后做类似的事情server.listen()？
回答by Alnitak
The common pattern for nodejs modules is to create a file (e.g. mymodule.js) so:
nodejs 模块的常见模式是创建一个文件（例如mymodule.js），以便：
var myFunc = function() {
...
};
exports.myFunc = myFunc;
If you store this in the directory node_modulesit can be imported thus:
如果将其存储在目录中，node_modules则可以这样导入：
var mymodule = require('mymodule');
mymodule.myFunc(args...);
So, in your case, your module server.jscould look like this:
因此，在您的情况下，您的模块server.js可能如下所示：
// server.js
var http = require("http");
var listen = function(port) {
var server = http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type" : "text/html"});
response.write("Hello World");
response.end();
});
server.listen(port);
};
exports.listen = listen;
which would be invoked:
这将被调用：
// client.js
var server = require('server');
server.listen(8000);
回答by zergius
Old post, but if someone is still interested in I would suggest following solution:
旧帖子，但如果有人仍然对我感兴趣，我会建议以下解决方案：
//server.js
var http = require("http");
// As soon as method will be used outside the module, use "this":
this.listen = function(port) {
var server = http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("Hello World");
response.end();
});
server.listen(port);
};
//index.js
var module = require('./server');
module.listen(8000);
回答by Raynos
// main.js
var server = require("server");
server.listen(8000);
console.log("Server has started.");
// server.js
var http = require("http");
var server = http.createServer(function(request, response) {
response.writeHead(200, {
"Content-Type": "text/html"
});
response.write("Hello World");
response.end();
});
module.exports = server;
