How to implement high-performance loading order in javascript

This article mainly introduces you to the relevant information about the loading order and execution principle of high-performance JavaScript. The article introduces it in great detail through sample code. It has certain reference learning value for everyone's study or work. It is needed Friends, let’s study together.

Preface

The performance of JavaScript in the browser can be considered the most serious usability problem faced by developers. Today, myself After reading the chapter on high-performance javascript loading and execution, let’s talk about how to solve the loading order and execution principle of js. I won’t say much below, let’s take a look at the detailed introduction:

When the browser encounters the