Explanation of methods to implement synchronization and asynchronous loading of JavaScript files

This article mainly introduces the implementation code of synchronous and asynchronous loading of JavaScript files, which has certain reference value. Those who are interested can learn about

References to JS files, although there are currently many frameworks and tools (such as webpack, commonjs, requiresjs, etc.) are all handled well. But aside from these frameworks, it is still helpful to understand the native loading method. This article briefly describes the synchronous and asynchronous loading methods of some js files.

Synchronous loading

Can be inserted into the html file with the