Analysis of loading processing instances of module dependencies in seajs

This article describes the loading processing of module dependencies in seajs. Share it for your reference, as follows:

Recently, I found some module dependencies issues when working on projects, and I will record them:

For example, there are 3 existing files:

/**/
define(function(require, exports, module){
 require('jquery');
 require('');
})
/**/
define(function(require, exports, module){
 require('jquery');
 require('');
 //code...
})
/**/
define(functioin(require, exports, module){
 require('jquery');
 //code...
})

For example, when executing, , will depend on jquery. So how does seajs handle jquery in this case? Only execute once? Execute multiple times? Or another way?

Here we refer to Yu Bo's answer:

I'm rightThe understanding of module calls is that calling refers to obtaining the interface of a certain module.. In SeaJS,Only , , and require will generate module calls,for example:var a = require('./a')existWhen executing require('./a'), the module's interface will be obtained. If it is called for the first time, module a will be initialized. When it is called later, the module a will be directly returned to the module a interface.; define is just the module information registered, such as after packaging:define(id, deps, factory)It is to register a module into , define similar to:[id] = { id: id, dependencies: deps, factory: factory }

It is pure registration information.

andrequire('./a')Only when['a'].factory, after execution['a'].exports

Extension: The difference between URI and URL

URI:Uniform Resource Identifiers, Uniform Resource Identifier;

URL:Uniform Resource Locators, unified resource locators;

URN:Uniform Resource Names, Uniform Resource Name

URL, URN is a subset of URI.

refer to

Specific meaning: /seajs/seajs/issues/303
Distinguish between URI, URL and URNhttp:///developerworks/cn/xml/

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I hope this article will be helpful to everyone's JavaScript programming.