从不同模块读取的 Requirejs 无法读取未定义的属性

Requirejs reading from different modules cannot ready properly of undefined

我正在试验 require.js,但在访问其他模块内部的模块组件时遇到问题。在下面的示例中,我试图从 main 中的 sandbox.js 模块访问我的垃圾函数。有人可以帮助指出我做错了什么吗?

main.js

require.config({
     baseUrl: "assets/js",
     paths: {
        jquery: ['https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min'],
        bootstrap: ['https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js']
     }
});

require(["jquery", "sandbox"], function($, sandbox){


console.log( sandbox.junk );

});

Sandbox.js

define(['jquery'], function($){
    console.log("firebase.js is online");


    var junk = function(){
        return "tinoy";
    }

});

在进一步研究之后,我做了以下允许我在模块之间进行通信的操作:

main.js

require.config({
     baseUrl: "assets/js",
     paths: {
        jquery: ['https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min'],
        bootstrap: ['https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js']
     },

     shim: {
        /* Set bootstrap dependencies (just jQuery) */
        'bootstrap' : ['jquery'],
        'firebase': {
                  exports: 'firebase'
              }
    }
});

require(["jquery", "sandbox"], function($, sandbox){

console.log( junk() );



}); //close main require

sandbox.js

define(['jquery'], function($){


    this.junk = function(){
        return "tinoy";
    }

});