Shulou(Shulou.com)06/01 Report--

This article introduces the relevant knowledge of "JavaScript variable promotion example analysis". In the actual case operation process, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

variable lift

In JavaScript, variables defined by the var keyword can be declared after use, that is, variables can be declared after use (JavaScript variable promotion).

examples

//You can use the carName variable here

var carName;

Variables defined by the let keyword cannot be declared after use, that is, variables need to be declared before use.

//carName variable cannot be used here

let carName;

"JavaScript variable promotion example analysis" content is introduced here, thank you for reading. If you want to know more about industry-related knowledge, you can pay attention to the website. Xiaobian will output more high-quality practical articles for everyone!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.