require | 易学教程

What are the paths that “require” looks up by default?

阅读更多关于 What are the paths that “require” looks up by default?

问题 In Ruby, I have been told that when doing require "some_file" Ruby will look for the file in certain places. I know that it looks for some_file.rb , but where does it look for it by default? 回答1: It depends on your platform, and how Ruby was compiled, so there is no "the" answer to this. You can find out by running: ruby -e 'puts $:' Generally, though, you have the standard, site, and vendor Ruby library paths, including an arch, version, and general directory under each. 回答2: Ruby looks in

Derived class defined later in the same file “does not exist”?

阅读更多关于 Derived class defined later in the same file “does not exist”?

问题 Let’s suppose we’ve got two php files, a.php and b.php Here’s content of file a.php: <?php // content of a.php class A { } And here’s the content of file b.php <?php // content of b.php include dirname(__FILE__) . "/a.php"; echo "A: ", class_exists("A") ? "exists" : "doesn’t exist", "\n"; echo "B: ", class_exists("B") ? "exists" : "doesn’t exist", "\n"; echo "BA (before): ", class_exists("BA") ? "exists" : "doesn’t exist", "\n"; echo "BB: ", class_exists("BB") ? "exists" : "doesn’t exist", "

webpack dynamic module loader by require

阅读更多关于 webpack dynamic module loader by require

OK, i have searched high and low but cannot reliably deterrmine if this is or is not possible with webpack. https://github.com/webpack/webpack/tree/master/examples/require.context Appears to indicate that one can pass a string to a function and it load a module... But my attempt is just not working: webpack.config.js 'use strict'; let webpack = require('webpack'), jsonLoader = require("json-loader"), path = require("path"), fs = require('fs'), nodeModules = {}; fs.readdirSync('node_modules') .filter(function(x) { return ['.bin'].indexOf(x) === -1; }) .forEach(function(mod) { nodeModules[mod] =

Getting closure-compiler and Node.js to play nice

阅读更多关于 Getting closure-compiler and Node.js to play nice

问题 Are there any projects that used node.js and closure-compiler (CC for short) together? The official CC recommendation is to compile all code for an application together, but when I compile some simple node.js code which contains a require("./MyLib.js") , that line is put directly into the output, but it doesn't make any sense in that context. I see a few options: Code the entire application as a single file. This solves the problem by avoiding it, but is bad for maintenance. Assume that all

What is the difference between require('mypackage.js') and require('mypackage')?

阅读更多关于 What is the difference between require('mypackage.js') and require('mypackage')?

Both these require statements appear to work the same way: var Mypackage = require('mypackage.js'); var Mypackage require('mypackage'); Is there a difference between them? Amol M Kulkarni Here is the answer: Module.prototype.load = function(filename) { debug('load ' + JSON.stringify(filename) + ' for module ' + JSON.stringify(this.id)); assert(!this.loaded); this.filename = filename; this.paths = Module._nodeModulePaths(path.dirname(filename)); var extension = path.extname(filename) || '.js'; if (!Module._extensions[extension]) extension = '.js'; Module._extensions[extension](this, filename);

Webpack and external libraries

阅读更多关于 Webpack and external libraries

I’m trying out webpack ( http://webpack.github.io/ ) and it looks really nice, however I’m kind of stuck here. Say that I’m using a CDN for a library, f.ex jQuery. Then in my code, I want the require('jquery') to automatically point to the global jquery instance, instead of trying to include it from my modules. I’ve tried using plugins like the IgnorePlugin : new webpack.IgnorePlugin(new RegExp("^(jquery|react)$")) This works for ignoring the library, but it still says that the required module is "missing" when I run the webpacker. Somehow I need to tell webpack that jquery should be picked up

PHP: Require path does not work for cron job?

阅读更多关于 PHP: Require path does not work for cron job?

问题 I have a cron job that needs to include this file: require '../includes/common.php'; however, when it is run via the cron job (and not my local testing), the relative path does not work. the cron job runs the following file (on the live server): /home/username123/public_html/cron/mycronjob.php and here's the error: Fatal error: require(): Failed opening required '../includes/common.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/username123/public_html/cron/mycronjob.php on

Swift REPL: how to import, load, evaluate, or require a .swift file?

阅读更多关于 Swift REPL: how to import, load, evaluate, or require a .swift file?

问题 In the Swift REPL, how to import (a.k.a. load, evaluate, require) a typical text *.swift file? I want to use the code from this file: ~/src/Foo.swift Syntax like this doesn't work: import ~/src/Foo.swift For comparison: An equivalent solution in the Swift REPL for a framework is: import Foundation An equivalent solution in the Ruby REPL for a *.ruby file is: require "~/src/foo" These are similar questions that are /not/ what I'm asking: How to use/make a Swift command-line script, executable,

Browserify with require('fs')

阅读更多关于 Browserify with require('fs')

I was trying to use browserify on a file that uses the fs object. When I browserify it, the call to require('fs') doesn't get transformed and require returns {} . Is there any workaround for this? I've seen some suggestions on stackoverlow and elsewhere, but none seem to be fully realized. I actually hoped to create a google web packaged app using browserify for a class I teach. Thanks in advance. Which filesystem should the browser use then? The HTML5 filesystem is not really comparable to a traditional filesystem. It doesn't have symlinks, and it is only accessible asynchronously outside Web

require_once :failed to open stream: no such file or directory

阅读更多关于 require_once :failed to open stream: no such file or directory

问题 I have this testing code in "PAGE A" : <?php require_once('../mysite/php/classes/eventManager.php'); $x=new EventManager(); $y=$x->loadNumbers(); ?> "eventManager.php" has inside a require_once: <?php require_once('../includes/dbconn.inc'); class EventManager {...} ?> My folders structure is this: mysite/php/classes folder and includes folder If i test PAGE A in a browser i receive: Warning: require_once(../includes/dbconn.inc) [function.require-once]: failed to open stream: No such file or