【疑问】最终推荐的loose pattern 如果依赖module 没有加载完毕，行为如何，是否报错

Loose Augmentation

While our example above requires our initial module creation to be first, and the augmentation to happen second, that isn’t always necessary. One of the best things a JavaScript application can do for performance is to load scripts asynchronously. We can create flexible multi-part modules that can load themselves in any order with loose augmentation. Each file should have the following structure:

var MODULE = (function (my) {
    
	// add capabilities...

	return my;
}(MODULE || {
    }));

In this pattern, the var statement is always necessary. Note that the import will create the module if it does not already exist. This means you can use a tool like LABjs and load all of your module files in parallel, without needing to block.

Refrence

• JavaScript Module Pattern: In-Depth