Javascript 如何从 Node.js 中的 URL 请求
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how to require from URL in Node.js
提问by
Is there a standard way to require a Node module located at some URL (not on the local filesystem)?
是否有一种标准的方法来要求位于某个 URL（不在本地文件系统上）的 Node 模块？
Something like:
就像是：
require('http://example.com/nodejsmodules/myModule.js');
Currently, I am simply fetching the file into a temporary file, and requiring that.
目前，我只是将文件提取到一个临时文件中，并要求这样做。
采纳答案by Phillip Kovalev
You can fetch module using http.getmethod and execute it in the sandbox using vmmodule methods runInThisContextand runInNewContext.
您可以使用http.get方法获取模块并使用vm模块方法runInThisContext和runInNewContext在沙箱中执行它。
Example
例子
var http = require('http')
, vm = require('vm')
, concat = require('concat-stream'); // this is just a helper to receive the
// http payload in a single callback
// see https://www.npmjs.com/package/concat-stream
http.get({
host: 'example.com',
port: 80,
path: '/hello.js'
},
function(res) {
res.setEncoding('utf8');
res.pipe(concat({ encoding: 'string' }, function(remoteSrc) {
vm.runInThisContext(remoteSrc, 'remote_modules/hello.js');
}));
});
IMO, execution of the remote code inside server application runtime may be reasonable in the case without alternatives. And only if you trust to the remote service and the network between.
IMO，在没有替代方案的情况下，在服务器应用程序运行时内执行远程代码可能是合理的。并且仅当您信任远程服务和网络之间的关系时。
回答by reubano
If you want something more like require, you can do this:
如果你想要更像的东西require，你可以这样做：
var http = require('http')
, vm = require('vm')
, concat = require('concat-stream')
, async = require('async');
function http_require(url, callback) {
http.get(url, function(res) {
// console.log('fetching: ' + url)
res.setEncoding('utf8');
res.pipe(concat({encoding: 'string'}, function(data) {
callback(null, vm.runInThisContext(data));
}));
})
}
urls = [
'http://example.com/nodejsmodules/myModule1.js',
'http://example.com/nodejsmodules/myModule2.js',
'http://example.com/nodejsmodules/myModule3.js',
]
async.map(urls, http_require, function(err, results) {
// `results` is an array of values returned by `runInThisContext`
// the rest of your program logic
});
回答by William Leung
0 dependency version (node 6+ required, you can simply change it back to ES5)
0 依赖版本（需要节点 6+，您可以简单地将其改回 ES5）
const http = require('http'), vm = require('vm');
['http://example.com/nodejsmodules/myModule.js'].forEach(url => {
http.get(url, res => {
if (res.statusCode === 200 && /^text\/javascript/.test(res.headers['content-type'])) {
let rawData = '';
res.setEncoding('utf8');
res.on('data', chunk => { rawData += chunk; });
res.on('end', () => { vm.runInThisContext(rawData, url); });
}
});
});
It is still the asynchronous version, if sync load is the case, a sync http request modulefor exampleshould be required
它仍然是异步版本，如果是同步负载，则需要sync http request module例如
回答by Olivier Lalonde
You could overwrite the default require handler for .js files:
您可以覆盖 .js 文件的默认 require 处理程序：
require.extensions['.js'] = function (module, filename) {
// ...
}
You might want to checkout better-requireas it does pretty much this for many file formats. (I wrote it)
您可能想要结帐更好-需要，因为它对许多文件格式几乎都这样做。（我写的）
回答by u10200770
const localeSrc = 'https://www.trip.com/m/i18n/100012631/zh-HK.js';
const http = require('http');
const vm = require('vm');
const concat = require('concat-stream');
http.get(
localeSrc,
res => {
res.setEncoding('utf8');
res.pipe(
concat({ encoding: 'string' }, remoteSrc => {
let context = {};
const script = new vm.Script(remoteSrc);
script.runInNewContext(context);
console.log(context);
}),
);
},
err => {
console.log('err', err);
},
);
回答by Berlari Dengan Angin
Install the module first :
首先安装模块：
npm install require-from-url
And then put in your file :
然后放入你的文件：
var requireFromUrl = require('require-from-url/sync');
requireFromUrl("http://example.com/nodejsmodules/myModule.js");
