Description and example usage of javascript Asynchronous callback

This article mainly explains "javascript asynchronous callback description and example usage", the explanation content in the article is simple and clear, easy to learn and understand, please follow the idea of Xiaobian slowly in-depth, together to study and learn "javascript asynchronous callback description and example usage" bar!

description

Asynchronous callbacks are executed after higher-order functions are executed. Non-blocking: Higher-order functions complete their execution without waiting for callbacks, and higher-order functions ensure that callbacks are executed later on specific events.

DOM event listeners are also asynchronous call event handlers.

That is, a subtype of callback functions.

examples

console.log ('setTimeout () Start') setTimeout (function later() {console.log ('later () called ')}, 2000) console.log ('setTimeout() complete')// setTimeout () starts// setTimeout() finishes// later() is called (2 seconds later) Thank you for reading, the above is the content of "javascript asynchronous callback description and example usage", after learning this article, I believe that we have a deeper understanding of javascript asynchronous callback description and example usage, and the specific use needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!