javascript - understanding of asynchronous modules

Question

For synchronous modules, the module must be loaded into memory in advance. For asynchronous modules, for example, its implementation of requirejs relies on front-end and is executed in advance. Isn't this also loaded into memory in advance? So why is it said to be asynchronous? I read a lot about AMD and CMD, but I just don’t understand synchronous module loading...

淡淡烟草味 · Answer

This mechanism has little to do with [memory], and can be understood more as [script download timing].

The particularity of the front-end is that the size and download time of the script file will directly affect the page performance. In the specification of synchronous loading, all dependencies must be downloaded before the script can be executed.

In the specification of asynchronous loading, the required script will be loaded only when the code runs to the required location. For example, in a huge single-page application, the script on the home page can be very light, and when entering a certain function page, the required modules can be loaded asynchronously, which will greatly help the performance.

我想大声告诉你 · Answer

The asynchronous loading of requirejs essentially appends the

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